CVE-2026-125402
Ettercap through 0.8.4.1 Heap Out-of-Bounds Read via TLS SNI Parsing
Ettercap through 0.8.4.1 contains a heap out-of-bounds read vulnerability in sslw_get_clienthello_sni() in src/ec_sslwrap.c that trusts the unchecked 16-bit SNI length field. Network-adjacent attackers can send crafted TLS ClientHello messages during SSL interception to leak up to 64 KB of heap memory upstream or crash Ettercap.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| ettercap Ettercap Ettercap/ettercap
github |
≥ 0; ≤ 0.8.4.1 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 7.2 high |
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 8.1 high |
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/Ettercap/ettercap/security/advisories/GHSA-v48w-7cvh-c7f4CNA: VulnCheck · vendor-advisory
- https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98CNA: VulnCheck · patch
- https://github.com/Ettercap/ettercap/pull/1330CNA: VulnCheck · issue-tracking, patch
- https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/ec_sslwrap.c#L589-L604CNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-heap-out-of-bounds-read-via-tls-sni-parsingCNA: VulnCheck · third-party-advisory
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