Buffer overflow in Freerdp
CVE-2026-111880
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.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cmgx-558f-vh67 (vendor-advisory)
- www.vulncheck.com/advisories/freerdp-2.0.0-before-3.32.0-heap-out-of-bounds-wri… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111880?
- CVE-2026-111880 is a high-severity vulnerability in Freerdp, classified under Out-of-bounds Write. CVSS score: 7.4/10. Published 2026-10-17.
- How severe is CVE-2026-111880?
- High severity. CVSS v3 base score is 7.4 out of 10.