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CVE-2026-33977

CVE-2026-33977 · FreeRDP: DoS via WINPR_ASSERT in IMA ADPCM audio decoder (dsp.c:331)

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

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, a malicious RDP server can crash the FreeRDP client by sending audio data in IMA ADPCM format with an invalid initial step index value (>= 89). The unvalidated step index is read directly from the network and used to index into a 89-entry lookup table, triggering a WINPR_ASSERT() failure and process abort via SIGABRT. This affects any FreeRDP client that has audio redirection (RDPSND) enabled, which is the default configuration. This issue has been patched in version 3.24.2.

CVSS 6.9 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • freerdp

    Versions
    • < 3.24.2: Affected

    No fix published

  • freerdp2 Debian:12

    Versions
    • 2.10.0+dfsg1-1
    • 2.10.0+dfsg1-1.1
    • 2.11.2+dfsg1-1
    • 2.11.2+dfsg1-1.1~exp1
    • 2.11.2+dfsg1-1.1~exp2
    • 2.11.5+dfsg1-1
    • 2.11.7+dfsg1-1
    • 2.11.7+dfsg1-2
    • 2.11.7+dfsg1-3
    • 2.11.7+dfsg1-4
    • 2.11.7+dfsg1-5
    • 2.11.7+dfsg1-6
    • 2.11.7+dfsg1-6~deb12u1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • freerdp3 Debian:13

    Versions
    • 3.15.0+dfsg-2.1
    • 3.15.0+dfsg-2.1+deb13u1
    Affected ranges
    • ECOSYSTEM: < 3.15.0+dfsg-2.1+deb13u2

    Update to 3.15.0+dfsg-2.1+deb13u2

  • freerdp3 Debian:14

    Versions
    • 3.15.0+dfsg-2.1
    • 3.16.0+dfsg-1
    • 3.16.0+dfsg-2
    • 3.17.0+dfsg-1
    • 3.17.1+dfsg-1
    • 3.17.1+dfsg-2
    • 3.17.2+dfsg-1
    • 3.17.2+dfsg-2
    • 3.17.2+dfsg-3
    • 3.18.0+dfsg-1
    • 3.19.0+dfsg-1
    • 3.19.1+dfsg-1
    • 3.20.0+dfsg-1
    • 3.20.2+dfsg-1
    • 3.21.0+dfsg-1
    • 3.22.0+dfsg-1
    • 3.22.0+dfsg-1~bpo13+0
    • 3.22.0+dfsg-1~bpo13+1
    • 3.22.0+dfsg-3
    • 3.23.0+dfsg-1
    • 3.23.0+dfsg-1~bpo13+1
    • 3.24.0+dfsg-1
    • 3.24.0+dfsg-2
    • 3.24.1+dfsg-1
    • 3.24.2+dfsg-1~bpo13+1
    Affected ranges
    • ECOSYSTEM: < 3.24.2+dfsg-1

    Update to 3.24.2+dfsg-1

  • freerdp Ubuntu:16.04:LTS

    Versions
    • 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1
    • 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.2
    • 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.3
    • 1.1.0~git20140921.1.440916e+dfsg1-5ubuntu1.4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • freerdp2 Ubuntu:Pro:18.04:LTS

    Versions
    • 2.0.0~git20170725.1.1648deb+dfsg1-1
    • 2.0.0~git20170725.1.1648deb+dfsg1-5
    • 2.0.0~git20170725.1.1648deb+dfsg1-5ubuntu1
    • 2.0.0~git20170725.1.1648deb+dfsg1-5ubuntu2
    • 2.0.0~git20170725.1.1648deb+dfsg1-6
    • 2.0.0~git20170725.1.1648deb+dfsg1-6build1
    • 2.0.0~git20170725.1.1648deb+dfsg1-7
    • 2.0.0~git20170725.1.1648deb+dfsg1-7ubuntu0.1
    • 2.1.1+dfsg1-0ubuntu0.18.04.1
    • 2.2.0+dfsg1-0ubuntu0.18.04.1
    • 2.2.0+dfsg1-0ubuntu0.18.04.2
    • 2.2.0+dfsg1-0ubuntu0.18.04.3
    • 2.2.0+dfsg1-0ubuntu0.18.04.4
    • 2.2.0+dfsg1-0ubuntu0.18.04.4+esm1
    • 2.2.0+dfsg1-0ubuntu0.18.04.4+esm2
    • 2.2.0+dfsg1-0ubuntu0.18.04.4+esm3
    • 2.2.0+dfsg1-0ubuntu0.18.04.4+esm4
    • 2.2.0+dfsg1-0ubuntu0.18.04.4+esm5
    • 2.2.0+dfsg1-0ubuntu0.18.04.4+esm6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • freerdp Ubuntu:18.04:LTS

    Versions
    • 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1
    • 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.1
    • 1.1.0~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • freerdp2 Ubuntu:Pro:20.04:LTS

    Versions
    • 2.0.0~git20190204.1.2693389a+dfsg1-1
    • 2.0.0~git20190204.1.2693389a+dfsg1-2
    • 2.0.0~git20190204.1.2693389a+dfsg1-2build1
    • 2.0.0~git20190204.1.2693389a+dfsg1-2build2
    • 2.1.1+dfsg1-0ubuntu0.20.04.1
    • 2.2.0+dfsg1-0ubuntu0.20.04.1
    • 2.2.0+dfsg1-0ubuntu0.20.04.2
    • 2.2.0+dfsg1-0ubuntu0.20.04.3
    • 2.2.0+dfsg1-0ubuntu0.20.04.4
    • 2.2.0+dfsg1-0ubuntu0.20.04.5
    • 2.2.0+dfsg1-0ubuntu0.20.04.6
    • 2.6.1+dfsg1-0ubuntu0.20.04.1
    • 2.6.1+dfsg1-0ubuntu0.20.04.2
    • 2.6.1+dfsg1-0ubuntu0.20.04.2+esm1
    • 2.6.1+dfsg1-0ubuntu0.20.04.2+esm2
    • 2.6.1+dfsg1-0ubuntu0.20.04.2+esm3
    • 2.6.1+dfsg1-0ubuntu0.20.04.2+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • freerdp2 Ubuntu:22.04:LTS

    Versions
    • 2.3.0+dfsg1-2build1
    • 2.3.0+dfsg1-2ubuntu1
    • 2.3.0+dfsg1-2ubuntu2
    • 2.4.1+dfsg1-1
    • 2.4.1+dfsg1-1ubuntu1
    • 2.4.1+dfsg1-1ubuntu2
    • 2.5.0+dfsg1-1
    • 2.6.0+dfsg1-1
    • 2.6.1+dfsg1-1
    • 2.6.1+dfsg1-3
    • 2.6.1+dfsg1-3ubuntu1
    • 2.6.1+dfsg1-3ubuntu2
    • 2.6.1+dfsg1-3ubuntu2.1
    • 2.6.1+dfsg1-3ubuntu2.2
    • 2.6.1+dfsg1-3ubuntu2.3
    • 2.6.1+dfsg1-3ubuntu2.4
    • 2.6.1+dfsg1-3ubuntu2.5
    • 2.6.1+dfsg1-3ubuntu2.6
    • 2.6.1+dfsg1-3ubuntu2.7
    • 2.6.1+dfsg1-3ubuntu2.8
    • 2.6.1+dfsg1-3ubuntu2.9
    • 2.6.1+dfsg1-3ubuntu2.10
    • 2.6.1+dfsg1-3ubuntu2.11
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • freerdp3 Ubuntu:24.04:LTS

    Versions
    • 3.4.0+dfsg1-0ubuntu2
    • 3.4.0+dfsg1-0ubuntu3
    • 3.4.0+dfsg1-0ubuntu4
    • 3.5.0+dfsg1-0ubuntu1
    • 3.5.1+dfsg1-0ubuntu1
    • 3.5.1+dfsg1-0ubuntu1.1
    • 3.5.1+dfsg1-0ubuntu1.2
    • 3.5.1+dfsg1-0ubuntu1.4
    • 3.5.1+dfsg1-0ubuntu1.5
    • 3.5.1+dfsg1-0ubuntu1.6
    Affected ranges
    • ECOSYSTEM: < 3.30.0+dfsg-0ubuntu0.24.04.1

    Update to 3.30.0+dfsg-0ubuntu0.24.04.1

  • freerdp2 Ubuntu:Pro:24.04:LTS

    Versions
    • 2.10.0+dfsg1-1.1ubuntu1
    • 2.11.2+dfsg1-1
    • 2.11.2+dfsg1-1build1
    • 2.11.2+dfsg1-1build3
    • 2.11.5+dfsg1-1build1
    • 2.11.5+dfsg1-1build2
    • 2.11.5+dfsg1-1ubuntu0.1~esm1
    • 2.11.5+dfsg1-1ubuntu0.1~esm2
    • 2.11.5+dfsg1-1ubuntu0.1~esm3
    • 2.11.5+dfsg1-1ubuntu0.1~esm4
    • 2.11.5+dfsg1-1ubuntu0.1~esm5
    • 2.11.5+dfsg1-1ubuntu0.1~esm6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • freerdp3 Ubuntu:25.10

    Versions
    • 3.14.0+dfsg-1ubuntu1
    • 3.15.0+dfsg-2.1
    • 3.16.0+dfsg-1ubuntu1
    • 3.16.0+dfsg-2
    • 3.16.0+dfsg-2ubuntu0.1
    • 3.16.0+dfsg-2ubuntu0.3
    • 3.16.0+dfsg-2ubuntu0.4
    • 3.16.0+dfsg-2ubuntu0.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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