Out-of-bounds Read in Ettercap
CVE-2026-125403
Ettercap through 0.8.4.1 contains an out-of-bounds read and size_t underflow vulnerability in sslw_remove_sts() in src/ec_sslwrap.c, caused by a stale length and an unchecked memmem() result when stripping Strict-Transport-Security headers. A malicious HTTPS server whose response passes through Ettercap's SSL interception can trigger out-of-bounds reads and memory corruption in the Ettercap process, which normally runs as root.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:A/AC:L/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/Ettercap/ettercap/security/advisories/GHSA-hq2w-pg4m-6w63 (vendor-advisory)
- github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98 (patch)
- github.com/Ettercap/ettercap/pull/1330 (issue-tracking, patch)
- github.com/Ettercap/ettercap/blob/v0.8.4.1/src/ec_sslwrap.c (technical-description)
- www.vulncheck.com/advisories/ettercap-through-0.8.4.1-out-of-bounds-read-via-ss… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125403?
- CVE-2026-125403 is a high-severity vulnerability in Ettercap, classified under Out-of-bounds Read. CVSS score: 8.1/10. Published 2026-11-10.
- How severe is CVE-2026-125403?
- High severity. CVSS v3 base score is 8.1 out of 10.