CVE-2009-0071

What it is

Mozilla Firefox 3.0.5 and earlier 3.0.x versions, when designMode is enabled, allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a certain (a) replaceChild or (b) removeChild call, followed by a (1) queryCommandValue, (2) queryCommandState, or (3) queryCommandIndeterm call. NOTE: it was later reported that 3.0.6 and 3.0.7 are also affected.

At a glance

Exploitability

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

Exploit odds

6.6% 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. 2009-01-08 19:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:04 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 6.6% in the next 30 days (EPSS).
• Severity: 2.6 LOW (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2009-01-08 19:30 UTC

Last modified

2026-06-16 23:04 UTC

Exploit probability

6.6% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Mozilla Firefox 3.0
• Mozilla Firefox 3.0.1
• Mozilla Firefox 3.0.2
• Mozilla Firefox 3.0.3
• Mozilla Firefox 3.0.4
• Mozilla Firefox 3.0.5

Attack profile CVSS 2.0 · 2.6

Attack vector

Network

Complexity

High

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

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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