CVE-2010-0220: Mozilla Firefox

Medium severity, CVSS 5.0. EPSS: 1.5% chance of exploitation in the next 30 days.

The nsObserverList::FillObserverArray function in xpcom/ds/nsObserverList.cpp in Mozilla Firefox before 3.5.7 allows remote attackers to cause a denial of service (application crash) via a crafted web site that triggers memory consumption and an accompanying Low Memory alert dialog, and also triggers attempted removal of an observer from an empty observers array.

Affected products

• Mozilla Firefox: up to and including 3.5.6; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.5 only; …

Published 2010-01-07. Last modified 2026-06-16.