Heap Out-of-Bounds Read Vulnerability in Ettercap by Ettercap Project
CVE-2026-125402

7.2HIGH

Key Information:

Vendor

Ettercap

Status
Ettercap
Vendor
CVE Published:
9 November 2026

What is CVE-2026-125402?

Ettercap versions up to 0.8.4.1 are susceptible to a heap out-of-bounds read vulnerability in the function sslw_get_clienthello_sni(). This flaw arises due to improper validation of the 16-bit SNI length field in crafted TLS ClientHello messages, allowing network-adjacent attackers to potentially leak up to 64 KB of heap memory during SSL interception. This can lead to unauthorized data exposure or may cause the Ettercap application to crash.

Affected Version(s)

ettercap 0 <= 0.8.4.1

References

https://github.com/Ettercap/ettercap/security/advisories/...
vendor-advisory
https://github.com/Ettercap/ettercap/commit/1d8badb713579...
patch
https://github.com/Ettercap/ettercap/pull/1330
issue-trackingpatch

CVSS V4

Score:
7.2
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Adiel Sol, Arad Inbar, Erez Cohen, Nir Somech, Ben Grinberg, Daniel Lubel, Shir Sadon (DREAM Security Research Team)
Emilio Escobar
.