CVE-2023-39352: Invalid offset validation leading to Out Of Bound Write in FreeRDP

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-08-31 · updated 2026-06-17
Weakness: CWE-787

Description

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. Affected versions are subject to an invalid offset validation leading to Out Of Bound Write. This can be triggered when the values `rect->left` and `rect->top` are exactly equal to `surface->width` and `surface->height`. eg. `rect->left` == `surface->width` && `rect->top` == `surface->height`. In practice this should cause a crash. This issue has been addressed in versions 2.11.0 and 3.0.0-beta3. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

Debian Linux: 10.0
Fedoraproject Fedora: 37, 38, 39
FreeRDP: before 2.11.0; 3.0.0-beta1, 3.0.0-beta2 — fixed in 2.11.0

How to fix

Upgrade to a fixed version: FreeRDP 2.11.0. Check the vendor advisory for mitigations.

References

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