CVE-2021-34520

High (8.1) in microsoft. EPSS 4.4% chance of exploitation in the next 30 days.

EPSS

4.4% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-31)

CWE

CWE-502

Published

2021-07-14

Modified

2026-08-10

Record from

the NVD, synced 2026-10-19

Affected

• microsoft:sharepoint_foundation
• microsoft:sharepoint_server

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34520
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34520
• https://www.zerodayinitiative.com/advisories/ZDI-21-828/

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