CVE-2013-1690: Mozilla Firefox and Thunderbird Denial-of-Service Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
CSIRTS triage
- What
- Mozilla Firefox and Thunderbird do not properly handle onreadystatechange events, allowing denial-of-service attacks.
- Who is affected
- Users of Mozilla Firefox and Thunderbird who visit crafted websites.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Update to the latest version of Firefox and Thunderbird.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2013-1690
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2013-1690Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2013-1690 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Mozilla Firefox and
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[UPDATE] [high] Mozilla Firefox, Firefox ESR and Thunderbird: Multiple vulnerabilitiescert-bund · 2026-07-10
- high[UPDATE] [high] Mozilla Firefox and Thunderbird: Multiple vulnerabilitiescert-bund · 2026-07-09
- high[UPDATE] [high] Mozilla Firefox: Multiple vulnerabilitiescert-bund · 2026-07-09
- medium[NEW] [medium] Mozilla Firefox for iOS: Vulnerability allows display of false informationcert-bund · 2026-07-07
- unknownVulnerability in Mozilla Firefox for iOS (July 7, 2026)cert-fr-avis · 2026-07-07
- high[UPDATE] [high] Mozilla Firefox: Vulnerability allows code executioncert-bund · 2026-07-02
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