CVE-2021-34448

MEDIUM severity · CVSS 6.8 · Out-of-bounds write · actively exploited (CISA KEV)

6.8CVSS MEDIUM ● exploited

🔴 Actively exploited in the wild (CISA Known Exploited Vulnerabilities). Added to KEV 2021-11-03. US federal agencies must patch by 2021-11-17.

Summary

Scripting Engine Memory Corruption Vulnerability

Impact & exploitability

Attack vectorNetwork

Attack complexityHigh

Privileges requiredNone

User interactionRequired

Confidentiality impactHigh

Integrity impactHigh

Availability impactNone

Exploit probability (EPSS)3%

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

Affected products we track (1)

Windows Server 2019

Recommendation

This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.

Official patch: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448 ↗

Additional information

NVD record
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448Patch
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448Patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34448