CVE-2021-35940

Publication date 23 August 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

An out-of-bounds array read in the apr_time_exp*() functions was fixed in the Apache Portable Runtime 1.6.3 release (CVE-2017-12613). The fix for this issue was not carried forward to the APR 1.7.x branch, and hence version 1.7.0 regressed compared to 1.6.3 and is vulnerable to the same issue.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apr	22.04 LTS jammy	Fixed 1.7.0-6ubuntu1
	21.10 impish	Fixed 1.7.0-6ubuntu1
	21.04 hirsute	Fixed 1.7.0-6ubuntu0.1
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Fixed 1.5.2-3ubuntu0.1~esm1
	14.04 LTS trusty	Fixed 1.5.0-1ubuntu0.1~esm1

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Notes

leosilva

the fix was removed in 1.7.x branches, but it is addressed in 1.6.x and later. xenial and trusty/esm are affected.

Severity score breakdown

Parameter	Value
Base score	7.1 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-5056-1
APR vulnerability
30 August 2021