CVE-2021-27216

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-06 · updated 2026-06-17
Weakness: CWE-362

Description

Exim 4 before 4.94.2 has Execution with Unnecessary Privileges. By leveraging a delete_pid_file race condition, a local user can delete arbitrary files as root. This involves the -oP and -oPX options.

Affected products

Exim: before 4.94.2 — fixed in 4.94.2

How to fix

Upgrade to a fixed version: Exim 4.94.2. Check the vendor advisory for mitigations.

References

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28007-LFDIR.txt
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28007-LFDIR.txt

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