Is CVE-2013-2551 being actively exploited?

Yes. CVE-2013-2551 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on March 28, 2022.

What is the CVSS score for CVE-2013-2551?

CVE-2013-2551 has a CVSS 3.1 base score of 8.8 (HIGH).

CVE-2013-2551

HIGH · CVSS 8.8CISA KEV: actively exploitedEPSS 74.1%EU EUVD: exploited

Use-after-free vulnerability in Microsoft Internet Explorer 6 through 10 allows remote attackers to execute arbitrary code via a crafted web site that triggers access to a deleted object, as demonstrated by VUPEN during a Pwn2Own competition at CanSecWest 2013, aka "Internet Explorer Use After Free Vulnerability," a different vulnerability than CVE-2013-1308 and CVE-2013-1309.

Key facts

CVSS score: 8.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
EPSS score: 74.1% (99th percentile)
In CISA KEV: Yes, added March 28, 2022
In EU EUVD: Yes (EUVD-2013-2493)
Published: March 11, 2013
NVD last modified: June 16, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Microsoft Internet Explorer Use-After-Free Vulnerability

Added to the KEV catalog on March 28, 2022; federal remediation due April 18, 2022. Known to be used in ransomware campaigns.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-2493 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 22, 2025.

View on the EU Vulnerability Database

Affected products

microsoft / internet explorer
microsoft / internet explorer
microsoft / internet explorer
microsoft / internet explorer
microsoft / internet explorer
microsoft / windows 7
microsoft / windows 8
microsoft / windows rt
microsoft / windows server 2003
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2012
microsoft / windows vista
microsoft / windows xp
microsoft / windows xp

References

http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/Pwn2Own-2013/ba-p/5981157(Broken Link, Third Party Advisory)
http://twitter.com/VUPEN/statuses/309479075385327617(Broken Link)
http://twitter.com/thezdi/statuses/309452625173176320(Not Applicable)
http://www.us-cert.gov/ncas/alerts/TA13-134A(Third Party Advisory, US Government Resource)
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-037(Patch, Vendor Advisory)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16317(Broken Link)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2013-2551(US Government Resource)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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