CVE-2023-40574: Out-Of-Bounds Write in FreeRDP

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% 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 Out-Of-Bounds Write in the `writePixelBGRX` function. This issue is likely down to incorrect calculations of the `nHeight` and `srcStep` variables. This issue has been addressed in version 3.0.0-beta3. Users are advised to upgrade. There are no known workarounds for this issue.

Affected products

FreeRDP: 3.0.0-beta1, 3.0.0-beta2

References

https://github.com/FreeRDP/FreeRDP/blob/5be5553e0da72178a4b94cc1ffbdace9ceb153e5/libfreerdp/primitives/prim_YUV.c#L414-L445
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-422p-gj6x-93cw
https://security.gentoo.org/glsa/202401-16
https://github.com/FreeRDP/FreeRDP/blob/5be5553e0da72178a4b94cc1ffbdace9ceb153e5/libfreerdp/primitives/prim_YUV.c#L414-L445
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-422p-gj6x-93cw
https://security.gentoo.org/glsa/202401-16

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