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CVE-2022-39317

Out of bounds read in zgfx decoder in FreeRDP

MEDIUM
4.6
CVSS Score
Published: November 16, 2022 at 12:00 AM UTC
Updated: June 17, 2026 at 04:58 AM UTC
2 products affected across 2 vendorsFedoraFreeRDP

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Severity
MEDIUM4.6
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
3637
FreeRDP· Freerdp
95%
v < 2.9.0
Affected range stops below 2.9.0, so it looks safe — our inference, not a vendor statement

References (4)

Third Party Advisory
Source: [email protected]
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-99cm-4gw7-c8jh
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UDOTAOJBCZKREZJPT6VZ25GESI5T6RBG/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGQN3OWQNHSMWKOF4D35PF5ASKNLC74B/
Vendor Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202401-16

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.6MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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