CVE-2026-125406
Ettercap through 0.8.4.1 Stack Buffer Underwrite via Telnet Dissector Backspace Handling
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-124 |
| Vendor | ettercap |
| Product | ettercap |
| Published | Nov 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Ettercap / ettercap
0 ≤ 0.8.4.1
References
github.com: https://github.com/Ettercap/ettercap/security/advisories/GHSA-w5ch-7c4x-crcc github.com: https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98 github.com: https://github.com/Ettercap/ettercap/pull/1330 github.com: https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_telnet.c#L150-L159 vulncheck.com: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-underwrite-via-telnet-dissector-backspace-handling
Credits
Adiel Sol, Arad Inbar, Erez Cohen, Nir Somech, Ben Grinberg, Daniel Lubel, Shir Sadon (DREAM Security Research Team) Emilio Escobar