{"kind": "product", "path": "vulns/ubuntu-26.10/tightvnc", "name": "tightvnc", "product": "tightvnc", "ecosystem": "Ubuntu:26.10", "items": [{"id": "CVE-2026-50538", "noindex": false, "published": "2026-08-21T21:03:58.147Z", "modified": "2026-08-24T19:39:57.811Z", "cvss": 8.8, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "severity": "high", "epss": 0.00404, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-50538", "title": "libvncclient Tight decoder has an attacker-controlled heap out-of-bounds write", "description": "LibVNCClient is a library for easy implementation of a VNC client. In versions 0.9.12 through 0.9.15, a malicious (or man-in-the-middle) VNC server can force a connecting `libvncclient` to write attacker-controlled data past the end of its framebuffer. This is an out-of-bounds heap write with attacker-controlled length, contents, and offset. It needs no authentication (the attacker\nis the server), works in a default build with default settings, and fires from a single `FramebufferUpdate` the moment the victim connects. It crashes any client unconditionally (denial of service); we also demonstrated it overwriting an application callback pointe", "references": ["https://github.com/LibVNC/libvncserver/security/advisories/GHSA-v9pm-47h4-jcq8", "https://github.com/LibVNC/libvncserver/commit/540332be3e0acc566fa64da6f1b4680c72c724dd", "https://nvd.nist.gov/vuln/detail/CVE-2026-50538"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-44988", "noindex": false, "published": "2026-05-27T14:26:50.063Z", "modified": "2026-05-29T15:16:13.607Z", "cvss": 8.8, "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "severity": "high", "epss": 0.00242, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-44988", "title": "LibVNCClient Tight Gradient decoding allows malicious server-triggered heap/stack OOB writes", "description": "LibVNCClient is a library for easy implementation of a VNC client. In 0.9.15 and earlier, LibVNCClient's Tight encoding decoder uses fixed-size 2048-pixel scratch buffers for the Gradient filter, but it does not reject Tight rectangles whose width is larger than 2048 pixels. A malicious VNC server can send a crafted FramebufferUpdate rectangle using Tight encoding with NoZlib | ExplicitFilter and the Gradient filter. When a LibVNCClient-based client connects, the client processes the server-controlled rectangle width and writes beyond fixed-size Gradient buffers. This vulnerability is fixed with commit 5b270544b85233668b98161323297d418a8f5fd1", "references": ["https://github.com/LibVNC/libvncserver/security/advisories/GHSA-jcc5-8wj4-7c58", "https://github.com/LibVNC/libvncserver/commit/5b270544b85233668b98161323297d418a8f5fd1", "https://nvd.nist.gov/vuln/detail/CVE-2026-44988"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-32854", "noindex": false, "published": "2026-03-24T17:31:32.011Z", "modified": "2026-07-14T18:40:05.677Z", "cvss": 6.3, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "severity": "medium", "epss": 0.05415, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-32854", "title": "LibVNCServer httpd proxy NULL Pointer Dereference", "description": "LibVNCServer versions 0.9.15 and prior (fixed in commit dc78dee) contain null pointer dereference vulnerabilities in the HTTP proxy handlers within httpProcessInput() in httpd.c that allow remote attackers to cause a denial of service by sending specially crafted HTTP requests. Attackers can exploit missing validation of strchr() return values in the CONNECT and GET proxy handling paths to trigger null pointer dereferences and crash the server when httpd and proxy features are enabled.", "references": ["https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x", "https://github.com/LibVNC/libvncserver/commit/dc78dee51a7e270e537a541a17befdf2073f5314", "https://www.vulncheck.com/advisories/libvncserver-httpd-proxy-null-pointer-dereference"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2026-32853", "noindex": false, "published": "2026-03-24T17:30:40.061Z", "modified": "2026-07-14T18:40:05.005Z", "cvss": 6.9, "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N", "severity": "medium", "epss": 0.00445, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2026-32853", "title": "LibVNCServer UltraZip Encoding Heap Out-of-bounds Read", "description": "LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerability in the UltraZip encoding handler that allows a malicious VNC server to cause information disclosure or application crash. Attackers can exploit improper bounds checking in the HandleUltraZipBPP() function by manipulating subrectangle header counts to read beyond the allocated heap buffer.", "references": ["https://github.com/LibVNC/libvncserver/security/advisories/GHSA-87q7-v983-qwcj", "https://github.com/LibVNC/libvncserver/commit/009008e2f4d5a54dd71f422070df3af7b3dbc931", "https://www.vulncheck.com/advisories/libvncserver-ultrazip-encoding-heap-out-of-bounds-read"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2020-29260", "noindex": false, "published": "2022-09-02T22:14:35.000Z", "modified": "2024-08-04T16:48:01.600Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": 0.01131, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2020-29260", "title": "CVE-2020-29260", "description": "libvncclient v0.9.13 was discovered to contain a memory leak via the function rfbClientCleanup().", "references": ["https://github.com/LibVNC/libvncserver/commit/bef41f6ec4097a8ee094f90a1b34a708fbd757ec", "https://lists.debian.org/debian-lts-announce/2022/09/msg00035.html", "https://nvd.nist.gov/vuln/detail/CVE-2020-29260"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2020-25708", "noindex": false, "published": "2020-11-27T17:41:41.000Z", "modified": "2024-08-04T15:40:36.639Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": 0.01633, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2020-25708", "title": "CVE-2020-25708", "description": "A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw to send a specially crafted message that, when processed by the VNC server, would lead to a floating point exception, resulting in a denial of service.", "references": ["https://bugzilla.redhat.com/show_bug.cgi?id=1896739", "https://lists.debian.org/debian-lts-announce/2022/09/msg00035.html", "https://nvd.nist.gov/vuln/detail/CVE-2020-25708"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2019-15680", "noindex": false, "published": "2019-10-29T16:45:52.000Z", "modified": "2024-08-05T00:56:22.088Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": 0.02669, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2019-15680", "title": "CVE-2019-15680", "description": "TightVNC code version 1.3.10 contains null pointer dereference in HandleZlibBPP function, which results Denial of System (DoS). This attack appear to be exploitable via network connectivity.", "references": ["https://www.openwall.com/lists/oss-security/2018/12/10/5", "https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html", "https://usn.ubuntu.com/4407-1/"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2019-15679", "noindex": false, "published": "2019-10-29T16:45:04.000Z", "modified": "2024-08-05T00:56:22.416Z", "cvss": 9.8, "cvss_vector": "", "severity": "critical", "epss": 0.11842, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2019-15679", "title": "CVE-2019-15679", "description": "TightVNC code version 1.3.10 contains heap buffer overflow in InitialiseRFBConnection function, which can potentially result code execution. This attack appear to be exploitable via network connectivity.", "references": ["https://www.openwall.com/lists/oss-security/2018/12/10/5", "https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html", "https://cert-portal.siemens.com/productcert/pdf/ssa-478893.pdf"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2019-15678", "noindex": false, "published": "2019-10-29T16:44:08.000Z", "modified": "2024-08-05T00:56:22.434Z", "cvss": 9.8, "cvss_vector": "", "severity": "critical", "epss": 0.12805, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2019-15678", "title": "CVE-2019-15678", "description": "TightVNC code version 1.3.10 contains heap buffer overflow in rfbServerCutText handler, which can potentially result code execution.. This attack appear to be exploitable via network connectivity.", "references": ["https://www.openwall.com/lists/oss-security/2018/12/10/5", "https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html", "https://cert-portal.siemens.com/productcert/pdf/ssa-478893.pdf"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2019-8287", "noindex": false, "published": "2019-10-29T16:43:30.000Z", "modified": "2024-08-04T21:17:31.162Z", "cvss": 9.8, "cvss_vector": "", "severity": "critical", "epss": 0.19461, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2019-8287", "title": "CVE-2019-8287", "description": "TightVNC code version 1.3.10 contains global buffer overflow in HandleCoRREBBP macro function, which can potentially result code execution. This attack appear to be exploitable via network connectivity.", "references": ["https://www.openwall.com/lists/oss-security/2018/12/10/5", "https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html", "https://cert-portal.siemens.com/productcert/pdf/ssa-478893.pdf"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2019-15681", "noindex": false, "published": "2019-10-29T16:04:51.000Z", "modified": "2024-08-05T00:56:22.452Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": 0.02906, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2019-15681", "title": "CVE-2019-15681", "description": "LibVNC commit before d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a contains a memory leak (CWE-655) in VNC server code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appear to be exploitable via network connectivity. These vulnerabilities have been fixed in commit d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a.", "references": ["https://github.com/LibVNC/libvncserver/commit/d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a", "https://lists.debian.org/debian-lts-announce/2019/10/msg00039.html", "https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2018-20748", "noindex": false, "published": "2019-01-30T18:00:00.000Z", "modified": "2024-08-05T12:12:28.501Z", "cvss": 9.8, "cvss_vector": "", "severity": "critical", "epss": 0.0332, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2018-20748", "title": "CVE-2018-20748", "description": "LibVNC before 0.9.12 contains multiple heap out-of-bounds write vulnerabilities in libvncclient/rfbproto.c. The fix for CVE-2018-20019 was incomplete.", "references": ["https://lists.debian.org/debian-lts-announce/2019/01/msg00029.html", "https://github.com/LibVNC/libvncserver/commit/a64c3b37af9a6c8f8009d7516874b8d266b42bae", "https://github.com/LibVNC/libvncserver/commit/e34bcbb759ca5bef85809967a268fdf214c1ad2c"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2018-20022", "noindex": false, "published": "2018-12-19T16:00:00.000Z", "modified": "2024-08-05T11:51:18.317Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": 0.02937, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2018-20022", "title": "CVE-2018-20022", "description": "LibVNC before 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 contains multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR", "references": ["https://www.debian.org/security/2019/dsa-4383", "https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html", "https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-032-libvnc-multiple-memory-leaks/"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2018-20021", "noindex": false, "published": "2018-12-19T16:00:00.000Z", "modified": "2024-08-05T11:51:18.342Z", "cvss": 7.5, "cvss_vector": "", "severity": "high", "epss": 0.0342, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2018-20021", "title": "CVE-2018-20021", "description": "LibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM", "references": ["https://www.debian.org/security/2019/dsa-4383", "https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html", "https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-031-libvnc-infinite-loop/"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2018-20020", "noindex": false, "published": "2018-12-19T16:00:00.000Z", "modified": "2024-08-05T11:51:18.295Z", "cvss": 9.8, "cvss_vector": "", "severity": "critical", "epss": 0.08786, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2018-20020", "title": "CVE-2018-20020", "description": "LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution", "references": ["https://www.debian.org/security/2019/dsa-4383", "https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html", "https://usn.ubuntu.com/3877-1/"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2018-7225", "noindex": false, "published": "2018-02-19T15:00:00.000Z", "modified": "2024-08-05T06:24:11.789Z", "cvss": 9.8, "cvss_vector": "", "severity": "critical", "epss": 0.06106, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2018-7225", "title": "CVE-2018-7225", "description": "An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage() in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.", "references": ["https://www.debian.org/security/2018/dsa-4221", "https://usn.ubuntu.com/3618-1/", "https://github.com/LibVNC/libvncserver/issues/218"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}, {"id": "CVE-2014-6053", "noindex": false, "published": "2014-12-15T17:27:00.000Z", "modified": "2024-08-06T12:03:02.350Z", "cvss": null, "cvss_vector": "", "severity": "unknown", "epss": 0.07254, "kev": false, "exploits": [], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}], "path": "vulns/cve-2014-6053", "title": "CVE-2014-6053", "description": "The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not properly handle attempts to send a large amount of ClientCutText data, which allows remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is processed by using a single unchecked malloc.", "references": ["http://www.ocert.org/advisories/ocert-2014-007.html", "https://github.com/newsoft/libvncserver/commit/6037a9074d52b1963c97cb28ea1096c7c14cbf28", "http://secunia.com/advisories/61682"], "fixes": [], "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}]}], "total": 17, "unknown_count": 0, "release_unconfirmed": false, "page": 1, "pages": 1, "filtered": false, "noindex": false, "filters": {}, "page_size": 20, "products": [{"name": "tightvnc", "path": "vulns/ubuntu-26.10/tightvnc", "ecosystem": "Ubuntu:26.10"}], "stacks": [{"name": "system", "path": "vulns/stack/system", "slug": "system"}, {"name": "web", "path": "vulns/stack/web", "slug": "web"}, {"name": "php", "path": "vulns/stack/php", "slug": "php"}, {"name": "python", "path": "vulns/stack/python", "slug": "python"}, {"name": "node", "path": "vulns/stack/node", "slug": "node"}, {"name": "database", "path": "vulns/stack/database", "slug": "database"}, {"name": "containers", "path": "vulns/stack/containers", "slug": "containers"}, {"name": "network", "path": "vulns/stack/network", "slug": "network"}, {"name": "applications", "path": "vulns/stack/applications", "slug": "applications"}], "versions": [], "stats": {"recent": 0, "kev": 0}, "lastmod": "2026-08-24T19:39:57.811Z", "early_advisories": [], "license": "You may freely use the PatchFirst selection and our additions (priorities, early warnings, texts, summaries and aggregates) for your own purposes, including internal business use. 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News is credited with a link to the original source in each entry.", "sources": [{"id": "cve", "name": "CVE List / CVE.org", "url": "https://www.cve.org/", "license": "CVE Terms of Use", "terms_url": "https://www.cve.org/Legal/TermsOfUse", "notice": "Copyright © 1999–2021, The MITRE Corporation. LICENSE Submissions : For all materials you submit to the Common Vulnerabilities and Exposures (CVE™), you hereby grant to The MITRE Corporation (MITRE) and all CVE Numbering Authorities (CNAs) a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute such materials and derivative works. 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