CVE-2012-0451

What it is

CRLF injection vulnerability in Mozilla Firefox 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 allows remote web servers to bypass intended Content Security Policy (CSP) restrictions and possibly conduct cross-site scripting (XSS) attacks via crafted HTTP headers.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

2.4% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2012-03-14 19:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:37 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.4% in the next 30 days (EPSS).
• Severity: 4.3 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2012-03-14 19:55 UTC

Last modified

2026-06-16 23:37 UTC

Exploit probability

2.4% · EPSS, next 30 days

Weakness

CWE-94 · Code injection

Record status

Modified

Affected

• Mozilla Firefox 4.0
• Mozilla Firefox 4.0.1
• Mozilla Firefox 5.0
• Mozilla Firefox 5.0.1
• Mozilla Firefox 6.0
• Mozilla Firefox 6.0.1
• Mozilla Firefox 6.0.2
• Mozilla Firefox 7.0

Attack profile CVSS 2.0 · 4.3

Attack vector

Network

Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

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.

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