ACTIVELY EXPLOITED

CVE-2013-1690: Mozilla Firefox and Thunderbird Denial-of-Service Vulnerability

Facts
VendorMozilla
ProductFirefox and Thunderbird
Actively exploitedYes
Added to CISA KEV28 Mar 2022
CISA federal deadline18 Apr 2022
Weakness (CWE)CWE-119

Required action (CISA's text)

Apply updates per vendor instructions.

Description (NVD)

Mozilla Firefox and Thunderbird do not properly handle onreadystatechange events in conjunction with page reloading, which allows remote attackers to cause a denial-of-service (DoS) or possibly execute malicious code via a crafted web site.

SOURCES

Other Mozilla flaws

Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.