Critical severity · published May 6, 2021
CVE-2020-28026
Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters, relevant in non-default configurations that enable Delivery Status Notification (DSN)
9.8
CVSS
9.3%
EPSS
No
On KEV
Description
Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters, relevant in non-default configurations that enable Delivery Status Notification (DSN). Certain uses of ORCPT= can place a newline into a spool header file, and indirectly allow unauthenticated remote attackers to execute arbitrary commands as root.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)9.3% · higher than 95% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EX
Exim · Exim
4.00 before 4.94.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-28026
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-28026
Third Party Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28026-FGETS.txt
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