CVE-2026-23533CRITICAL 9.8EPSS p43.5%
CVE-2026-23533CVE-2026-23533
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the RDPGFX ClearCodec decode path when maliciously crafted residual data causes out-of-bounds writes during color output. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 0.59% probability of exploitation · percentile 43.5% · 2026-06-19T12:03:05Z |
| Published | 2026-01-19 |
| Last modified | 2026-01-28 |
Underlying weaknesses· 1
References
- https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L268-L281
- https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L336
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-32q9-m5qr-9j2v
1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Heap-based Buffer Overflowcwe-122 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.