CVE-2013-5603

What it is

Use-after-free vulnerability in the nsContentUtils::ContentIsHostIncludingDescendantOf function in Mozilla Firefox before 25.0, Firefox ESR 24.x before 24.1, Thunderbird before 24.1, and SeaMonkey before 2.22 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via vectors involving HTML document templates.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

5.4% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2013-10-30 10:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:59 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 5.4% in the next 30 days (EPSS).
• Severity: 10.0 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2013-10-30 10:55 UTC

Last modified

2026-06-16 23:59 UTC

Exploit probability

5.4% · EPSS, next 30 days

Record status

Modified

Affected

• Mozilla Thunderbird ≤ 24.0.1
• Mozilla Thunderbird 17.0
• Mozilla Thunderbird 17.0.1
• Mozilla Thunderbird 17.0.2
• Mozilla Thunderbird 17.0.3
• Mozilla Thunderbird 17.0.4
• Mozilla Thunderbird 17.0.5
• Mozilla Thunderbird 17.0.6

Attack profile CVSS 2.0 · 10.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

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-2013-5603.md and follow it. Check whether this project is affected by CVE-2013-5603. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge