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Fencer Vulns
high 7.5

CVE-2026-73241 json

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

published 2026-08-11 2 mo ago modified 2026-09-25 44 d ago also EUVD-2026-56934

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

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.

Patch / fix

  • freerdp freerdp 3.30.0
  • freerdp3 Debian 14 3.30.0+dfsg-1

debian advisories DEBIAN-CVE-2026-73241

  • freerdp3 Ubuntu 24.04 LTS 3.30.0+dfsg-0ubuntu0.24.04.1
  • freerdp3 Ubuntu 26.04 LTS 3.30.0+dfsg-0ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-73241

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • freerdp RHEL 10.2 2:3.10.3-12.el10_2.10
  • libwinpr RHEL 10.2 2:3.10.3-12.el10_2.10
  • freerdp-libs RHEL 10.2 2:3.10.3-12.el10_2.10
  • freerdp-server RHEL 10.2 2:3.10.3-12.el10_2.10
  • freerdp enterprise linux eus 10.0 2:3.10.3-3.el10_0.16
  • libwinpr enterprise linux eus 10.0 2:3.10.3-3.el10_0.16
  • freerdp-libs enterprise linux eus 10.0 2:3.10.3-3.el10_0.16
  • freerdp-server enterprise linux eus 10.0 2:3.10.3-3.el10_0.16

red hat advisories RHSA-2026:68706RHSA-2026:61378

  • freerdp AlmaLinux 10 2:3.10.3-12.el10_2.10
  • libwinpr AlmaLinux 10 2:3.10.3-12.el10_2.10
  • freerdp-libs AlmaLinux 10 2:3.10.3-12.el10_2.10
  • freerdp-server AlmaLinux 10 2:3.10.3-12.el10_2.10

almalinux advisories ALSA-2026:61378

  • freerdp Rocky Linux 10 2:3.10.3-12.el10_2.10

rocky linux advisories RLSA-2026:61378

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-73241 updated cvss 7.5

FreeRDP: FreeRDP: Authentication bypass via incorrect RDSTLS PDU handling

  • Red Hat Enterprise Linux AppStream (v. 10) freerdp 3.10.3-12.el10_2.10, libwinpr 3.10.3-12.el10_2.10, freerdp-libs 3.10.3-12.el10_2.10
    fixed: vendor fix “Do not enable RDSTLS server authentication (RdstlsSecurity); it is disabled by default. If FreeRDP is deployed as an RDP server with RDSTLS enabled, disable RdstlsSecurity” RHSA-2026:61378
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) freerdp 3.10.3-3.el10_0.16, libwinpr 3.10.3-3.el10_0.16, freerdp-libs 3.10.3-3.el10_0.16
    fixed: vendor fix “Do not enable RDSTLS server authentication (RdstlsSecurity); it is disabled by default. If FreeRDP is deployed as an RDP server with RDSTLS enabled, disable RdstlsSecurity” RHSA-2026:68706
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) freerdp-server 3.10.3-12.el10_2.10
    fixed: vendor fix “Do not enable RDSTLS server authentication (RdstlsSecurity); it is disabled by default. If FreeRDP is deployed as an RDP server with RDSTLS enabled, disable RdstlsSecurity” RHSA-2026:61378
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) freerdp-server 3.10.3-3.el10_0.16
    fixed: vendor fix “Do not enable RDSTLS server authentication (RdstlsSecurity); it is disabled by default. If FreeRDP is deployed as an RDP server with RDSTLS enabled, disable RdstlsSecurity” RHSA-2026:68706
  • Red Hat Enterprise Linux 6 freerdp, freerdp-libs, freerdp-plugins Red Hat Enterprise Linux 7 freerdp, libwinpr, freerdp-libs, freerdp-plugins Red Hat Enterprise Linux 8 freerdp, libwinpr, freerdp-libs Red Hat Enterprise Linux 9 freerdp, libwinpr, freerdp-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rqgv-grx4-xm6x referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 8.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • FreeRDP FreeRDP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.