How severe is CVE-2010-0249?

CVE-2010-0249 has a CVSS 3.1 base score of 8.8 (HIGH). EPSS estimates a 91.9% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2010-0249: Microsoft Internet Explorer Use-After-Free

CISA Known Exploited Vulnerabilities

Microsoft Internet Explorer Use-After-Free Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2026-05-20

Remediation due

2026-06-03

Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA notes
https://learn.microsoft.com/en-us/security-updates/SecurityAdvisories/2010/979352 ; https://nvd.nist.gov/vuln/detail/CVE-2010-0249

Description

Use-after-free vulnerability in Microsoft Internet Explorer 6, 6 SP1, 7, and 8 on Windows 2000 SP4; Windows XP SP2 and SP3; Windows Server 2003 SP2; Windows Vista Gold, SP1, and SP2; Windows Server 2008 Gold, SP2, and R2; and Windows 7 allows remote attackers to execute arbitrary code by accessing a pointer associated with a deleted object, related to incorrectly initialized memory and improper handling of objects in memory, as exploited in the wild in December 2009 and January 2010 during Operation Aurora, aka "HTML Object Memory Corruption Vulnerability."

Severity

CVSS 3.1 · CISA8.8 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Exploitation Context

as of October 15, 2026

All KEV statistics→

CISA added CVE-2010-0249 to the KEV catalog 5,969 days after its CVE record was published. The median for entries added in 2026 so far is 14 days.
It is one of 391 Microsoft entries in the CISA KEV catalog, and one of 40 added in 2026.
Its current EPSS score (91.9%) is higher than that of 75% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
-	-	n/a

References

14 Links

Vendor advisories

Exploits & PoCs

11167

Third-party advisories

Vulnerability databases

Other references

Record Details

Published

2010-01-15

Last updated

2026-05-21

Assigner (CNA)

microsoft

Credited to

More from Microsoft

All Microsoft CVEs→

CVE-2010-39628.1 HIGH

Microsoft Internet Explorer Uninitialized Memory Corruption Vulnerability

KEVEPSS 96.8%2010-11-05

CVE-2016-01897.5 HIGH

Microsoft Internet Explorer Memory Corruption Vulnerability

KEVEPSS 94.1%2016-05-11

CVE-2013-38938.8 HIGH

Microsoft Internet Explorer Resource Management Errors Vulnerability

KEVEPSS 87.5%2013-09-18

CVE-2020-06747.5 HIGH

Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability

MicrosoftKEVEPSS 86.9%2020-02-11

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.