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CVE-2026-125403

8.1, high

ettercap Out-of-Bounds Read Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.1, high high CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
10 Nov 2026today

Description

Ettercap through 0.8.4.1 contains an out-of-bounds read and size_t underflow vulnerability in sslw_remove_sts() in src/ec_sslwrap.c, caused by a stale length and an unchecked memmem() result when stripping Strict-Transport-Security headers. A malicious HTTPS server whose response passes through Ettercap's SSL interception can trigger out-of-bounds reads and memory corruption in the Ettercap process, which normally runs as root.

Details

Vendor
Ettercap
Product
ettercap
Weakness
CWE-125 (opens in a new tab)
Status
Received
Updated
10 Nov 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References 5

Patches and fixes 2

Advisories 1

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Ettercap CVEs

Every Ettercap CVE we hold

Same vendor in what we hold, not a known link between the flaws.

Beyond this page

Is CVE-2026-125403 in your network?

This page tells you how dangerous CVE-2026-125403 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 10 Nov 2026, not the live upstream state.