CVE-2022-37451

Publication date 6 August 2022

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Exim before 4.96 has an invalid free in pam_converse in auths/call_pam.c because store_free is not used after store_malloc.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
exim4	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

This is caused by store_internal_malloc being modified to store extra bytes in the following commit: https://github.com/Exim/exim/commit/1e30b0199daf7a7a882458251a3dc10d45d4c7d1

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
exim4	Upstream: 51be321

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H