# CVE-2026-125401: Ettercap through 0.8.4.1 Heap Buffer Overflow via Gadu-Gadu Dissector

Status: published. Published: 2026-11-09. Updated: 2026-11-09.

Ettercap through 0.8.4.1 contains a heap buffer overflow vulnerability in gg_get_version() in src/dissectors/ec_gg.c that writes up to 44 bytes into a 30-byte allocation. Remote attackers can send Gadu-Gadu traffic on TCP port 8074 with a crafted version field through a monitored network to corrupt heap memory in the Ettercap process, which normally runs as root.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/Ettercap/ettercap/pull/1330

## Affected products and versions

- Ettercap / ettercap (Ettercap/ettercap): ≥ 0; ≤ 0.8.4.1 (affected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.2 (high); CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-122

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/Ettercap/ettercap/security/advisories/GHSA-vrjv-f8gv-2h35 (CNA: VulnCheck; vendor-advisory)

- https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98 (CNA: VulnCheck; patch)

- https://github.com/Ettercap/ettercap/pull/1330 (CNA: VulnCheck; issue-tracking, patch)

- https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_gg.c#L599 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-heap-buffer-overflow-via-gadu-gadu-dissector (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-125401; retrieved 2026-11-10; source updated 2026-11-09

Revision: 1bf9fa001b1c464f38d63801a04d9ddafe5de3144a5b3400525068cee4317d0e

Canonical: https://y2.dev/cve/CVE-2026-125401

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