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Fencer Vulns
medium 4.6

CVE-2022-39317 json

Out of bounds read in zgfx decoder in FreeRDP

published 2022-11-16 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-41801

cvss
4.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

FreeRDP is a free remote desktop protocol library and clients. Affected versions of FreeRDP are missing a range check for input offset index in ZGFX decoder. A malicious server can trick a FreeRDP based client to read out of bound data and try to decode it. This issue has been addressed in version 2.9.0. There are no known workarounds for this issue.

Patch / fix

  • freerdp freerdp 2.9.0
  • freerdp2 Debian 12 2.9.0+dfsg1-1

debian advisories DEBIAN-CVE-2022-39317

  • freerdp2 Ubuntu 18.04 LTS 2.2.0+dfsg1-0ubuntu0.18.04.4
  • freerdp2 Ubuntu 20.04 LTS 2.2.0+dfsg1-0ubuntu0.20.04.4
  • freerdp2 Ubuntu 22.04 LTS 2.6.1+dfsg1-3ubuntu2.3

ubuntu advisories UBUNTU-CVE-2022-39317

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • freerdp RHEL 8 2:2.2.0-10.el8
  • libwinpr RHEL 8 2:2.2.0-10.el8
  • freerdp-libs RHEL 8 2:2.2.0-10.el8
  • freerdp RHEL 9 2:2.4.1-5.el9
  • libwinpr RHEL 9 2:2.4.1-5.el9
  • freerdp-libs RHEL 9 2:2.4.1-5.el9

red hat advisories RHSA-2023:2851RHSA-2023:2326

  • freerdp SLE Workstation Extension 12 SP5, SLE Software Development Kit 12 SP5 2.1.2-12.35.1
  • freerdp SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP4, openSUSE Leap 15.4 2.4.0-150400.3.18.1

suse advisories SUSE-SU-2023:0400-1SUSE-SU-2023:0399-1

  • freerdp AlmaLinux 8 2:2.2.0-10.el8
  • libwinpr AlmaLinux 8 2:2.2.0-10.el8
  • freerdp-libs AlmaLinux 8 2:2.2.0-10.el8
  • freerdp AlmaLinux 9 2:2.4.1-5.el9
  • libwinpr AlmaLinux 9 2:2.4.1-5.el9
  • freerdp-libs AlmaLinux 9 2:2.4.1-5.el9

almalinux advisories ALSA-2023:2851ALSA-2023:2326

  • freerdp Rocky Linux 8 2:2.2.0-10.el8

rocky linux advisories RLSA-2023:2851

  • freerdp Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 2.9.0-r0
  • freerdp2 Alpine 3.24, Alpine 3.23, Alpine 3.22 2.9.0-r0

alpine advisories ALPINE-CVE-2022-39317

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-39317 updated cvss 3.7

freerdp: undefined behaviour in zgfx decoder

  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins Red Hat Enterprise Linux 7 freerdp, libwinpr, freerdp-libs, freerdp-plugins
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) freerdp 2.2.0-10.el8, libwinpr 2.2.0-10.el8, freerdp-libs 2.2.0-10.el8
    fixed: vendor fix RHSA-2023:2851
  • Red Hat Enterprise Linux AppStream (v. 9) freerdp 2.4.1-5.el9, libwinpr 2.4.1-5.el9, freerdp-libs 2.4.1-5.el9
    fixed: vendor fix RHSA-2023:2326
  • Red Hat Enterprise Linux CRB (v. 8) freerdp-devel 2.2.0-10.el8, freerdp-debuginfo 2.2.0-10.el8, libwinpr-debuginfo 2.2.0-10.el8, freerdp-debugsource 2.2.0-10.el8, freerdp-libs-debuginfo 2.2.0-10.el8
    fixed: vendor fix RHSA-2023:2851
  • Red Hat Enterprise Linux CRB (v. 9) freerdp-devel 2.4.1-5.el9, libwinpr-devel 2.4.1-5.el9, freerdp-debuginfo 2.4.1-5.el9, libwinpr-debuginfo 2.4.1-5.el9, freerdp-debugsource 2.4.1-5.el9, freerdp-libs-debuginfo 2.4.1-5.el9
    fixed: vendor fix RHSA-2023:2326

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.6 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
NVD 3.1 4.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L

Affected products

  • FreeRDP FreeRDP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.