CVE-2021-26421

Medium

Published: 11 May 2021

Published

11 May 2021

Modified

21 November 2024

KEV Added

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Patch

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CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N

EPSS Score 0.0167 82.5th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-26421 is a medium-severity an unspecified weakness vulnerability in Microsoft Lync Server. Its CVSS base score is 6.5 (Medium).

Operationally, ranked in the top 17.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

Skype for Business and Lync Spoofing Vulnerability

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

microsoft

lync server

2013

microsoft

skype for business server

2015

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.