# CVE-2026-125405: Ettercap out-of-bounds read in NTLM parsing

Source: https://junglewise.ai/threats/cve-2026-125405-ettercap-through-0-8-4-1-contains-an-out-of-bounds-read  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-125405 · Severity: high · CVSS 8.1 · Published 2026-11-10

Ettercap is a network traffic analysis and interception tool used to monitor and debug network communications. An attacker can send a specially crafted HTTP request with an invalid NTLM authentication header that causes Ettercap to read beyond its allocated memory, either leaking sensitive data from memory or crashing the application.

Technologies: [Ettercap](https://junglewise.ai/threats/technologies/ettercap-ettercap). Vendors: [Ettercap](https://junglewise.ai/threats/vendors/ettercap).

## Quick answers

**Is CVE-2026-125405 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-125405 being exploited in the wild.

**How severe is CVE-2026-125405?** High severity, with a CVSS score of 8.1, published 10 November 2026.

**Which products and versions are affected?** Ettercap through 0.8.4.1.

**Is there a fix for CVE-2026-125405?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-125405 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-125405?** Check whether you run Ettercap at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Parse_NTLM_Auth() function in src/dissectors/ec_http.c fails to validate NTLM message offsets before using them to read from a buffer, allowing out-of-bounds reads. An attacker observing traffic processed by Ettercap can trigger this by sending a crafted HTTP Authorization header with invalid NTLM offsets. The vulnerability results in information disclosure or denial of service.

## Affected products

- Ettercap Ettercap through 0.8.4.1

## Timeline

- 2026-11-10: disclosed

## References

- [https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_http.c](https://github.com/Ettercap/ettercap/blob/v0.8.4.1/src/dissectors/ec_http.c)
- [https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98](https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98)

## Related threats

- [Ettercap stack buffer underwrite in telnet dissector](https://junglewise.ai/threats/cve-2026-125406-ettercap-through-0-8-4-1-contains-a-stack-buffer-underwrite)
- [Ettercap integer underflow in CCMP decryption](https://junglewise.ai/threats/cve-2026-125404-ettercap-through-0-8-4-1-contains-an-integer-underflow-in-ccmp)
- [Ettercap out-of-bounds read in SSL header stripping](https://junglewise.ai/threats/cve-2026-125403-ettercap-through-0-8-4-1-contains-an-out-of-bounds-read-and-size)
- [Ettercap heap buffer overflow in Gadu-Gadu dissector](https://junglewise.ai/threats/cve-2026-125401-ettercap-through-0-8-4-1-contains-a-heap-buffer-overflow)
- [Ettercap use-after-free in PCRE filter processing](https://junglewise.ai/threats/cve-2026-125400-ettercap-through-0-8-4-1-contains-a-use-after-free-vulnerability)