Vulnerability in Ettercap
CVE-2026-125406
Ettercap through 0.8.4.1 contains a stack buffer underwrite vulnerability in the telnet dissector in src/dissectors/ec_telnet.c that decrements the output pointer on backspace without a lower bound check. Attackers can send a telnet stream with more backspaces than preceding characters to write below the stack buffer, corrupting the stack of the Ettercap process that normally runs as root.
Published .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/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-w5ch-7c4x-crcc (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/dissectors/ec_telnet.c (technical-description)
- www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-underwrite-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-125406?
- CVE-2026-125406 is a high-severity vulnerability in Ettercap, classified under Buffer Underwrite. CVSS score: 8.8/10. Published 2026-11-10.
- How severe is CVE-2026-125406?
- High severity. CVSS v3 base score is 8.8 out of 10.