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Fencer Intel
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 3mo ago modified last mo. 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

Is CVE-2026-73241 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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
2mo ago

Exploit prediction

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

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 Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.