CVE-2013-6673

What it is

Mozilla Firefox before 26.0, Firefox ESR 24.x before 24.2, Thunderbird before 24.2, and SeaMonkey before 2.23 do not recognize a user's removal of trust from an EV X.509 certificate, which makes it easier for man-in-the-middle attackers to spoof SSL servers in opportunistic circumstances via a valid certificate that is unacceptable to the user.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data tampering.

Exploit odds

2.9% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2013-12-11 15:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:00 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.9% in the next 30 days (EPSS).
• Severity: 5.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2013-12-11 15:55 UTC

Last modified

2026-06-17 00:00 UTC

Exploit probability

2.9% · EPSS, next 30 days

Weakness

CWE-310

Record status

Modified

Affected

• Fedoraproject Fedora 18
• Fedoraproject Fedora 19
• Fedoraproject Fedora 20
• Mozilla Firefox < 26.0
• Mozilla Firefox < 24.2
• Mozilla Seamonkey < 2.23
• Mozilla Thunderbird < 24.2
• Suse Linux Enterprise Software Development Kit 11.0

Attack profile CVSS 3.1 · 5.9

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2013-6673.md and follow it. Check whether this project is affected by CVE-2013-6673. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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