CVE-2021-34453

High (7.5) in microsoft exchange server. EPSS 2.8% chance of exploitation in the next 30 days.

EPSS

2.8% chance of exploitation in the next 30 days; higher than 86% of CVEs (scores of 2026-10-31)

Published

2021-10-13

Modified

2026-06-17

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:exchange_server

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34453
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34453

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