[UPDATE] [medium] FreeRDP: Vulnerability allows code execution and denial of service

mediumCVE-2026-55827

A remote, anonymous attacker can exploit a vulnerability in FreeRDP to execute arbitrary code and conduct a denial of service attack.

CSIRTS triage

vendor: FreeRDP product: FreeRDP Remote code execution Denial of service

What: A remote, anonymous attacker can exploit a vulnerability in FreeRDP to execute arbitrary code and conduct a denial of service attack.
Who is affected: Users of FreeRDP are affected.
Urgency: Remediation is medium urgency due to the potential for both code execution and denial of service.
Action: Update FreeRDP to the latest version to address this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-29
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1963

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-558270.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55827	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-55827: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clie…nvd

Recent advisories for FreeRDP

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-67306: FreeRDP versions 3.28.0 and earlier contain an out-of-bounds read vulnerability in the RDP6 pl…nvd · 2026-08-01
unknownCVE-2026-67305: FreeRDP Windows client before 3.29.0 contains a heap buffer overflow vulnerability in the clip…nvd · 2026-08-01
highCVE-2026-67304: FreeRDP before 3.29.0 contains a null pointer dereference vulnerability in smartcard device co…nvd · 2026-08-01
mediumCVE-2026-67303: FreeRDP before 3.29.0 contains a reachable assertion (WINPR_ASSERT(OutputBufferLength == Bytes…nvd · 2026-08-01
mediumCVE-2026-67302: FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a divide-by-zero vulnerability in…nvd · 2026-08-01
highCVE-2026-67301: FreeRDP before 3.29.0 contains out-of-bounds read vulnerabilities in the async update message …nvd · 2026-08-01