What’s Vulnerable › Vulnerabilities

CVE-2026-73241: FreeRDP: RDSTLS server authentication bypass: a credential-less Capabilities PDU is accepted at the auth step (fail-open `resultCode`)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-08-11 · updated 2026-09-25
• Weakness: CWE-287

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.30.0, FreeRDP server-side RDSTLS in libfreerdp/core/rdstls.c accepts an attacker-supplied RDSTLS_TYPE_CAPABILITIES PDU while rdstls_server_authenticate is waiting for RDSTLS_TYPE_AUTHREQ, leaving resultCode at RDSTLS_RESULT_SUCCESS and allowing a remote unauthenticated client to bypass the RedirectionGuid, username, domain, or password checks. This issue is fixed in version 3.30.0.

Affected products

• FreeRDP: before 3.30.0 — fixed in 3.30.0

How to fix

Upgrade to a fixed version: FreeRDP 3.30.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/commit/b05a9510787c83c87ffc5fa8d7cc9f06ed971695
• https://github.com/FreeRDP/FreeRDP/pull/13065
• https://github.com/FreeRDP/FreeRDP/releases/tag/3.30.0
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rqgv-grx4-xm6x
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rqgv-grx4-xm6x

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