Is CVE-2023-40187 actively exploited?

No active exploitation of CVE-2023-40187 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-40187 be exploited remotely?

Yes. CVE-2023-40187 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-40187?

CVE-2023-40187 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2023-40187

CWE-416Published: August 31, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. Affected versions of the 3.x beta branch are subject to a Use-After-Free issue in the `avc420_ensure_buffer` and `avc444_ensure_buffer` functions. If the value of `piDstSize[x]` is 0, `ppYUVDstData[x]` will be freed. However, in this case `ppYUVDstData[x]` will not have been updated which leads to a Use-After-Free vulnerability. This issue has been addressed in version 3.0.0-beta3. Users of the 3.x beta releases are advised to upgrade. There are no known workarounds for this vulnerability.

NVD Source

Risk Analysis

A use-after-free vulnerability exists in the FreeRDP 3.x beta branch, specifically within buffer management functions. This critical flaw has a 9.8 CVSS score and could be exploited remotely.

No public exploit is available, and it is not in the CISA KEV. The vulnerability is remotely exploitable.

Recommended Action

Users of the 3.x beta branch must upgrade to version 3.0.0-beta3.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-40187 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.