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

criticalknown exploitedpublic exploitCVE-2010-0249
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.
Microsoft Internet Explorer contains an use-after-free vulnerability that could allow remote attackers to execute arbitrary code by accessing a pointer associated with a deleted object. The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.

CSIRTS triage

vendor: Microsoftproduct: Internet ExplorerMemory corruption
What
Microsoft Internet Explorer contains a use-after-free vulnerability that could allow remote attackers to execute arbitrary code.
Who is affected
Users of Microsoft Internet Explorer, which may be end-of-life or end-of-service.
Urgency
Remediation is critical as the product may no longer receive updates and the vulnerability is actively exploited.
Action
Users should discontinue use of Internet Explorer and migrate to a supported browser.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-05-20
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2010-0249

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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2010-0249coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Internet Explorer

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.

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