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{"bugzilla": {"description": "freerdp: freerdp: Denial of Service via heap out-of-bounds write in NTLM authentication", "id": "2554625", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2554625"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["FreeRDP versions from 2.0.0 before 3.32.0 contain a heap out-of-bounds write in the server hash-callback NTLM path that fails to validate the MIC offset. Unauthenticated attackers can send a crafted AUTHENTICATE_MESSAGE with a backward session-key offset and MIC offset to write 16 zero bytes beyond the allocation.", "A flaw was found in FreeRDP. An out-of-bounds write vulnerability in the server-side NT LAN Manager (NTLM) authentication path can result in a Denial of Service (DoS). When processing authentication messages with hash callbacks enabled, FreeRDP fails to properly validate the Message Integrity Check (MIC) offset. A remote, unauthenticated attacker can exploit this issue by sending a specially crafted authentication message, corrupting heap memory and causing the server to crash."], "mitigation": {"lang": "en:us", "value": "Do not expose FreeRDP server or proxy endpoints that use SspiNtlmHashCallback to untrusted networks; restrict access with a host firewall and network segmentation. If the NTLM hash callback is not required, leave it unset so the vulnerable MIC path is not entered."}, "name": "CVE-2026-111880", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "impact": "important", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "impact": "important", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "impact": "important", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "impact": "important", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-10-17T18:46:08Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-111880\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-111880\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cmgx-558f-vh67\nhttps://www.vulncheck.com/advisories/freerdp-2.0.0-before-3.32.0-heap-out-of-bounds-write-via-ntlm-mic-offset"], "statement": "This issue is reachable only on FreeRDP server or proxy peers that configure the non-default SspiNtlmHashCallback NTLM hash callback, which is reflected as Attack Complexity: High. An unauthenticated network attacker can cause a fixed 16-byte out-of-bounds heap write, so Integrity and Availability are High; Confidentiality is None. Red Hat rates this Important (CVSS 7.4). Platform safeguards such as ASLR, NX, FORTIFY_SOURCE, and glibc allocator hardening may impede reliable code execution, but they do not prevent the out-of-bounds write or process crash, so the base metrics are unchanged.", "threat_severity": "Important"}