CVE-2020-28009

Published: May 6, 2021Modified: Jun 17, 2026

7.8

Vector

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

Exploitability: 1.8 / Impact: 5.9

Source: NVD

Description

Exim 4 before 4.94.2 allows Integer Overflow to Buffer Overflow because get_stdinput allows unbounded reads that are accompanied by unbounded increases in a certain size variable. NOTE: exploitation may be impractical because of the execution time needed to overflow (multiple days).

Affected (1)

Products: Exim: Exim

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Exim Exim	From 4.00 to 4.94.2

Related CWEs

Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

References (2)

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28009-STDIN.txt

Source: cve@mitre.org

Vendor Advisory

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28009-STDIN.txt

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

Timeline

No history available yet.