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CVE-2021-32675

CVE-2021-32675 · DoS vulnerability in Redis

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Redis is an open source, in-memory database that persists on disk. When parsing an incoming Redis Standard Protocol (RESP) request, Redis allocates memory according to user-specified values which determine the number of elements (in the multi-bulk header) and size of each element (in the bulk header). An attacker delivering specially crafted requests over multiple connections can cause the server to allocate significant amount of memory. Because the same parsing mechanism is used to handle authentication requests, this vulnerability can also be exploited by unauthenticated users. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. An additional workaround to mitigate this problem without patching the redis-server executable is to block access to prevent unauthenticated users from connecting to Redis. This can be done in different ways: Using network access control tools like firewalls, iptables, security groups, etc. or Enabling TLS and requiring users to authenticate using client side certificates.

CVSS 7.5 · High · EPSS 16.1% · Fix available

Published
Updated

Stack: system · database

Affected products and versions

  • redis

    Versions
    • < 5.0.14: Affected
    • >= 6.0.0, < 6.0.16: Affected
    • >= 6.2.0, < 6.2.6: Affected

    No fix published

  • redis Debian:12

    Affected ranges
    • ECOSYSTEM: < 5:6.0.16-1

    Update to 5:6.0.16-1

  • redis Debian:13

    Affected ranges
    • ECOSYSTEM: < 5:6.0.16-1

    Update to 5:6.0.16-1

  • redis Debian:14

    Affected ranges
    • ECOSYSTEM: < 5:6.0.16-1

    Update to 5:6.0.16-1

  • redis Ubuntu:Pro:14.04:LTS

    Versions
    • 2:2.6.13-1
    • 2:2.6.16-3
    • 2:2.8.0-1
    • 2:2.8.2-1
    • 2:2.8.4-2
    • 2:2.8.4-2ubuntu0.2
    • 2:2.8.4-2ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: < 2:2.8.4-2ubuntu0.2+esm2

    Update to 2:2.8.4-2ubuntu0.2+esm2

  • redis Ubuntu:Pro:16.04:LTS

    Versions
    • 2:3.0.3-3
    • 2:3.0.5-1
    • 2:3.0.5-2
    • 2:3.0.5-3
    • 2:3.0.5-4
    • 2:3.0.6-1
    • 2:3.0.6-1ubuntu0.2
    • 2:3.0.6-1ubuntu0.3
    • 2:3.0.6-1ubuntu0.4
    Affected ranges
    • ECOSYSTEM: < 2:3.0.6-1ubuntu0.4+esm1

    Update to 2:3.0.6-1ubuntu0.4+esm1

  • redis Ubuntu:Pro:18.04:LTS

    Versions
    • 4:4.0.1-7
    • 4:4.0.2-6
    • 4:4.0.2-9
    • 5:4.0.5-1
    • 5:4.0.6-1
    • 5:4.0.6-2
    • 5:4.0.7-1
    • 5:4.0.8-1
    • 5:4.0.8-2
    • 5:4.0.9-1
    • 5:4.0.9-1ubuntu0.1
    • 5:4.0.9-1ubuntu0.2
    • 5:4.0.9-1ubuntu0.2+esm2
    Affected ranges
    • ECOSYSTEM: < 5:4.0.9-1ubuntu0.2+esm3

    Update to 5:4.0.9-1ubuntu0.2+esm3

  • redis Ubuntu:Pro:20.04:LTS

    Versions
    • 5:5.0.5-2build1
    • 5:5.0.6-1
    • 5:5.0.7-1
    • 5:5.0.7-2
    • 5:5.0.7-2ubuntu0.1~esm1
    • 5:5.0.7-2ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 5:5.0.7-2ubuntu0.1+esm1

    Update to 5:5.0.7-2ubuntu0.1+esm1

Original sources

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