Medium severity · published May 6, 2021
CVE-2021-27216
Exim 4 before 4.94.2 has Execution with Unnecessary Privileges
6.3
CVSS
1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 62% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EX
Exim · Exim
before 4.94.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27216
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-27216
Exploit
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28007-LFDIR.txt
More from Exim
9.8
CVE-2019-16928
Exim Out-of-bounds Write Vulnerability
9.8
CVE-2019-10149
Exim Mail Transfer Agent (MTA) Improper Input Validation
9.8
CVE-2018-6789
Exim Buffer Overflow Vulnerability
9.8
CVE-2010-4344
Exim Heap-Based Buffer Overflow Vulnerability
7.8
CVE-2010-4345
Exim Privilege Escalation Vulnerability