Improper Neutralization of Line Delimiters in Exim Email Server by Exim
CVE-2020-28026

9.8CRITICAL

Key Information:

Vendor

Exim

Status
Exim
Vendor
CVE Published:
6 May 2021

What is CVE-2020-28026?

Exim Email Server versions prior to 4.94.2 exhibit improper handling of line delimiters, which can become critical under non-default configurations that enable Delivery Status Notification (DSN) features. Exploiting this vulnerability allows unauthorized remote attackers to inject newline characters into spool header files. This manipulation can facilitate the execution of arbitrary commands with root privileges, posing a significant security risk to affected systems.

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References

https://www.exim.org/static/doc/security/CVE-2020-qualys/...
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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