CVE-2023-40181 Integer-Underflow leading to Out-Of-Bound Read in FreeRDP

What is CVE-2023-40181?

CVE-2023-40181 is a medium-severity vulnerability in Debian Debian Linux, published on 31 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. Affected versions are subject to an Integer-Underflow leading to Out-Of-Bound Read in the `zgfx_decompress_segment` function. In the context of `CopyMemory`, it's possible to read data beyond the transmitted packet range and likely 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 issue.

Weakness: CWE-191, CWE-125

Which versions are affected by CVE-2023-40181?

It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Freerdp Freerdp.

How do I fix CVE-2023-40181?

Upgrade to a fixed version.

Is CVE-2023-40181 being exploited?

There is no known exploitation of CVE-2023-40181 in the wild and no public exploit code.

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• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2023-40181, GHSA-mxp4-rx7x-h2g8, UBUNTU-CVE-2023-40181.