Microsoft Internet Explorer Use-After-Free Vulnerability (CVE-2010-0249)
Severity: high · Patch status: patched · Since 2026-05-20 · CVE-2010-0249
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. CISA added CVE-2010-0249 to its Known Exploited Vulnerabilities catalog on May 20, 2026, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jun 3, 2026 (BOD 22-01); treat that as the outer limit.
Sources
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