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CVE-2021-26855

critical · 9.1Actively exploited

On the CISA Known Exploited Vulnerabilities catalog

Apply updates per vendor instructions.

Added 2021-11-03Remediation due 2022-05-03

A public exploit / detection template exists

Weaponised detection is publicly available, which meaningfully raises real-world risk regardless of CVSS. nuclei-templates →

Microsoft Exchange Server Remote Code Execution Vulnerability

9.1
CVSS
100.0%
EPSS (exploit prob.)
100th
EPSS percentile
2021-03-03
Published

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

Weaknesses

CWE-918

Affected products

VendorProductAffected versions
microsoftexchange_server2013
microsoftexchange_server2013
microsoftexchange_server2013
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2016
microsoftexchange_server2019
microsoftexchange_server2019
microsoftexchange_server2019
microsoftexchange_server2019
microsoftexchange_server2019
microsoftexchange_server2019
microsoftexchange_server2019
microsoftexchange_server2019
microsoftexchange_server2019

Check a specific version with /api/v1/cve/match.

References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2021-26855