CVE-2013-2551: in the CISA KEV catalogue
Microsoft Internet Explorer Use-After-Free Vulnerability. CISA added CVE-2013-2551 to the Known Exploited Vulnerabilities catalogue on 2022-03-28 with a default due date of 2022-04-18. Known ransomware campaign use: Known. Forensic triage flag: No.
Use-after-free vulnerability in Microsoft Internet Explorer allows remote attackers to execute remote code via a crafted web site that triggers access to a deleted object. (CISA description)
- Vendor / product
- Microsoft Internet Explorer
- CWE
- CWE-416
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 74%, percentile 99 (scored 2026-11-03)
EPSS puts about 74 in 100 odds (74%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2013-2551 in the CISA KEV catalogue?
Yes. CISA added CVE-2013-2551 (Microsoft Internet Explorer Use-After-Free Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-03-28. CISA's default due date for it is 2022-04-18.
Is CVE-2013-2551 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2013-2551.
What should I do about CVE-2013-2551?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2013-2551