Buffer overflow in Accel-Ppp
CVE-2026-123205
accel-ppp before 1.15.0 contains a heap buffer overflow vulnerability in the tcp, syslog and pgsql log targets that allows unauthenticated remote peers to overflow fixed heap buffers by producing log lines exceeding LOG_MAX_SIZE. Attackers within client-ip-range can send an L2TP Start-Control-Connection-Request with many string AVPs when verbose logging is enabled to corrupt heap memory and crash the daemon.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/accel-ppp/accel-ppp/blob/048d31cb446879e0d1a1471b4ab99135a92bf289/ac… (technical-description)
- github.com/accel-ppp/accel-ppp/commit/58e399400c4ef4b71472ab7c2c71c54a677a05a8 (patch)
- github.com/accel-ppp/accel-ppp/pull/374 (issue-tracking, patch)
- github.com/accel-ppp/accel-ppp/releases/tag/1.15.0 (release-notes)
- www.vulncheck.com/advisories/accel-ppp-before-1.15.0-heap-based-buffer-overflow… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123205?
- CVE-2026-123205 is a medium-severity vulnerability in Accel-Ppp, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-11-05.
- How severe is CVE-2026-123205?
- Medium severity. CVSS v3 base score is 6.5 out of 10.