Microsoft Patches Actively Exploited CVE-2025-62221
IPA warns that a Microsoft vulnerability, CVE-2025-62221, is being actively exploited and urges immediate patching via December's Patch Tuesday updates.
Sourceipa.go.jp — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2025-62221 as exploited in the wild.
On December 10, 2025 (JST), Microsoft released its monthly security update addressing multiple vulnerabilities across its products. IPA (Japan's Information-technology Promotion Agency) highlighted that exploitation of these flaws could lead to application crashes or full attacker control of affected PCs.
Of particular concern is CVE-2025-62221, which Microsoft has confirmed is being actively exploited in the wild. IPA warns that damage from this vulnerability could expand and is urging users and organizations to apply the security update immediately. Standard Windows Update mechanisms should automatically deliver the patch, though organizations managing updates centrally are advised to expedite deployment given the confirmed active exploitation.
No further technical details, affected products, or exploitation specifics were disclosed in this alert beyond what Microsoft has published. IPA notes it cannot answer questions beyond vendor-published information and directs inquiries to Microsoft directly.
Mentioned in this report
Source reporting: https://www.ipa.go.jp/security/security-alert/2025/1210-ms.html
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