---
id: "CVE-2026-125404"
page: "https://infrastack.ai/live/CVE-2026-125404"
kind: "vulnerability"
aliases: ["CVE-2026-125404"]
title: "Ettercap: short CCMP frame underflow overflows stack buffer, root process"
severity: "high"
cvss: 7.7
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "ettercap", "fixed": [], "affected": "<= 0.8.4.1", "ecosystem": "vendor"}]
ecosystems: []
tags: ["ettercap", "network-auditing", "other", "wireless"]
not_affected_if: ["no-ettercap-installed", "no-wifi-sniffing", "no-wpa-key-configured", "no-wpa-key-loaded"]
published_at: "2026-11-10T00:17:15+00:00"
first_seen_at: "2026-11-10T00:28:45+00:00"
updated_at: "2026-11-10T00:31:08+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-125404", "first_seen_at": "2026-11-10T00:28:45+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-10T00:31:08+00:00"}]
exploit_sources: []
---

# Ettercap: short CCMP frame underflow overflows stack buffer, root process

Link for people: https://infrastack.ai/live/CVE-2026-125404 (this .md is for agents)

Ettercap through 0.8.4.1 subtracts the 8-byte CCMP trailer from a frame without checking its length, an integer underflow in ccmp_decrypt(). An attacker on the same wireless network, with its WPA key loaded, can send a short crafted frame to overflow a stack buffer in Ettercap, which normally runs as root.

_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 release is fixed yet.
- Only exposed if Ettercap sniffs 802.11 in monitor mode with a WPA2/CCMP key configured (-W) and the 4-way handshake observed.
- A source build is fixed only if it includes commit 1d8badb713579419a29a494bb463a1af59707e98.

## Fix

No released version yet (advisory lists patched versions: None). Fix is merged on master in commit 1d8badb (PR #1330); build from master after that commit or wait for a release newer than 0.8.4.1.

## Timeline

- 2026-11-10T00:28:45+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-125404
- 2026-11-10T00:31:08+00:00 analyst — GHSA read: patched versions None; fix merged to master in commit 1d8badb (PR #1330, Nov 6 2026), no release yet. Needs monitor mode + WPA2/CCMP key and handshake. No exploitation or PoC seen.

## Documents

- [advisory] Vendor advisory: github.com https://github.com/Ettercap/ettercap/security/advisories/GHSA-j37f-7jx3-rf8j
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ettercap-through-0.8.4.1-stack-buffer-overflow-via-wpa-ccmp-decryption
- [fix] Patch: github.com https://github.com/Ettercap/ettercap/commit/1d8badb713579419a29a494bb463a1af59707e98

## From the sources

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.

---

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