---
id: "CVE-2026-125405"
page: "https://infrastack.ai/live/CVE-2026-125405"
kind: "vulnerability"
aliases: ["CVE-2026-125405"]
title: "Ettercap: crafted NTLM HTTP header reads past buffer, leaking memory"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "ettercap", "fixed": [], "affected": "<= 0.8.4.1", "ecosystem": "vendor"}]
ecosystems: []
tags: ["ettercap", "network-security", "other", "out-of-bounds-read", "pentesting"]
not_affected_if: ["ettercap-not-installed"]
published_at: "2026-11-10T00:17:15+00:00"
first_seen_at: "2026-11-10T00:28:45+00:00"
updated_at: "2026-11-10T00:31:13+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125405", "first_seen_at": "2026-11-10T00:28:45+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-10T00:31:13+00:00"}]
exploit_sources: []
---

# Ettercap: crafted NTLM HTTP header reads past buffer, leaking memory

Link for people: https://infrastack.ai/live/CVE-2026-125405 (this .md is for agents)

Ettercap through 0.8.4.1 fails to validate NTLM message offsets in Parse_NTLM_Auth(), so reading an HTTP Authorization header can read beyond the buffer. An attacker who sends a crafted header that Ettercap observes can disclose process memory or crash it.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:ettercap affected <= 0.8.4.1 fixed no fixed version listed

## How to check

- Run `ettercap --version`; 0.8.4.1 and earlier are affected, and no released version contains the fix yet.
- If you build from git, check that your tree includes commit 1d8badb713579419a29a494bb463a1af59707e98 (`git merge-base --is-ancestor 1d8badb HEAD`).
- Find hosts where Ettercap sniffs HTTP on a shared network (analysis workstations, pentest boxes). Packaged copies from distros may lack the fix too.

## Fix

No patched release yet (advisory lists patched versions: none). The fix is merged to master in commit 1d8badb (PR #1330, 2026-11-06): it validates the decoded NTLM length and every offset+len before reading. Build from master at or after that commit until a release ships.

## Timeline

- 2026-11-10T00:28:45+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125405
- 2026-11-10T00:31:13+00:00 analyst — Read GHSA-jw9q-j2rm-94j2 (affected <=0.8.4.1, patched: none, heap OOB read in Parse_NTLM_Auth/GetUnicodeString, adjacent-network) and merge commit 1d8badb (PR #1330, master, 2026-11-06). No release contains the fix. No exploitation or PoC seen; did not search social.

## Documents

- [advisory] Vendor advisory: github.com https://github.com/Ettercap/ettercap/security/advisories/GHSA-jw9q-j2rm-94j2
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-out-of-bounds-read-via-http-ntlm-authentication-parsing
- [fix] Patch: github.com https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98

## From the sources

Ettercap through 0.8.4.1 contains an out-of-bounds read vulnerability in Parse_NTLM_Auth() in src/dissectors/ec_http.c due to unvalidated NTLM message offsets. Attackers can send a crafted HTTP Authorization header observed by Ettercap to read beyond the buffer, disclosing memory or crashing the process.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_