CVE-2021-26421

Medium (6.5) in microsoft. EPSS 1.4% chance of exploitation in the next 30 days.

EPSS

1.4% chance of exploitation in the next 30 days; higher than 72% of CVEs (scores of 2026-10-31)

Published

2021-05-11

Modified

2026-06-17

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:lync_server
• microsoft:skype_for_business_server

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26421
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26421

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