CVE-2026-121960

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{"bugzilla": {"description": "freerdp: freerdp: Denial of Service via missing negotiation tokens in CredSSP request", "id": "2567558", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567558"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["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.", "A flaw was found in FreeRDP. An unauthenticated remote attacker could cause a Denial of Service (DoS) by sending a specially crafted Credential Security Support Provider (CredSSP) request that omits negotiation tokens. When processing this malformed request with Network Level Authentication (NLA) enabled, the server triggers an internal assertion failure that abruptly terminates the server process and drops active client sessions."], "mitigation": {"lang": "en:us", "value": "Restrict network exposure of the FreeRDP shadow server to trusted hosts or terminate the shadow server service if remote desktop sharing is not required.\n1. If the shadow server is running and not needed, terminate the `freerdp-shadow-cli` process.\n2. If the service must be accessible, restrict incoming connections to authorized management networks using firewalld:\nfirewall-cmd --permanent --zone=public --remove-port=3389/tcp\nfirewall-cmd --permanent --zone=trusted --add-source=<TRUSTED_IP_OR_CIDR>\nfirewall-cmd --reload\nCaveat: Restricting network access prevents unauthenticated remote clients from connecting to the shadow server session. Replace the port number if a non-default port was specified.\nWarning: Reloading firewall rules with `firewall-cmd --reload` may temporarily disrupt active network traffic."}, "name": "CVE-2026-121960", "public_date": "2026-11-04T15:33:23Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121960\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121960\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3pg4-5r42-wxvj\nhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-unauthenticated-denial-of-service-via-credssp-tsrequest"], "statement": "This vulnerability is rated as having an Important severity impact because an unauthenticated remote attacker can trigger an immediate server process termination without credentials or user interaction, resulting in a complete denial of service for active remote sessions. Within Red Hat Enterprise Linux environments, FreeRDP packages are primarily utilized for client-side remote desktop connectivity, and the shadow server utility is neither enabled nor executed by default. The risk is therefore confined to deployments where administrators explicitly run the shadow server with Network Level Authentication enabled and expose its listening port to untrusted networks.", "threat_severity": "Important"}

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