Read the docs
TI-2026-71719 Aliases CVE-2026-109952GHSA-c6qf-gf3v-f99j

Security protocol downgrade in FreeRDP client during negotiation

Priority MEDIUM 60CWE-757Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

The FreeRDP client from 3.0.0 before 3.32.0 does not check the security protocol that a server selects during negotiation against the protocol set the user enabled. A malicious server or man-in-the-middle can force a downgrade to a weaker protocol and receive the user's cleartext password. This flaw is classified as CWE-757, and a public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in nego_process_negotiation_response(), allowing a security protocol downgrade. A malicious server or man-in-the-middle can select RDSTLS to override /sec:nla pinning, complete authentication with an all-zero cookie, and receive the user's cleartext password in the Client Info PDU.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00324 25th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial FreeRDP (FreeRDP): 3.32.0Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeRDPFreeRDP3.0.0 to before 3.32.03.32.0Patch availableCNA
  • FreeRDP VendorFreeRDP Affected 3.0.0 to before 3.32.0 Fixed in 3.32.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*3.0.0 to before 3.32.0VulnerableFreeRDP
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions 3.0.0 to before 3.32.0 Vulnerable ·FreeRDP

Remediation

Update FreeRDP to version 3.32.0. Red Hat Enterprise Linux 10 is affected, and the sources list no fixed version for it, with the plan given as none available.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA FreeRDP (FreeRDP) Fixed in 3.32.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    FreeRDP 3.32.0

    20 records Highest priority Priority HIGH 1 HIGH, 15 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-71718 Heap buffer over-read in FreeRDP proxy DRDYNVC channel name handlingPriority HIGH 70
    • TI-2026-71714 Unbounded memory allocation in FreeRDP drive redirection readsPriority MEDIUM 64
    • TI-2026-71713 Reachable assertion in FreeRDP lets a malicious server crash clientsPriority MEDIUM 64
    Show all 20 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-109952
  2. 2026-10-13 Alias added: GHSA-c6qf-gf3v-f99j
  3. 2026-10-14 Priority changed: MEDIUM → LOW
  4. 2026-10-18 CISA SSVC decision points changed
  5. 2026-10-18 Priority changed: LOW → MEDIUM
  6. 2026-10-21 CVSS score added · NVD
  7. 2026-10-29 Affected versions changed · Red Hat
  8. 2026-10-29 CVSS score added · Red Hat

References

Exploit 1

  • TI-2026-85092 Use-after-free in FreeRDP rdpgfx channel close handling CVSS 4.0CRITICAL 9.3
  • TI-2026-85091 Out-of-bounds write in FreeRDP proxy via bitmap cache v2 capability CVSS 4.0CRITICAL 9.3
  • TI-2026-24435 FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write CVSS 3.1CRITICAL 9.8
  • TI-2023-21373 Out-Of-Bounds Write in FreeRDP CVSS 3.1CRITICAL 9.8
  • TI-2022-08692 Server side NTLM does not properly check parameters in FreeRDP CVSS 3.1CRITICAL 9.1
  • TI-2023-21374 Out-Of-Bounds Read in FreeRDP CVSS 3.1CRITICAL 9.1
See all 336 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences