Detections
Analytics

CVE-2026-21511

high

Description

Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21511

https://www.tenable.com/blog/microsofts-february-2026-patch-tuesday-addresses-54-cves-cve-2026-21510-cve-2026-21513

Details

Source: Mitre, NVD

Published: 2026-02-10

Updated: 2026-02-11

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

Severity: High

CVSS v3

Base Score: 7.5

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

Severity: High

EPSS

EPSS: 0.00257