CVE-2020-25681

Publication date 19 January 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary data in a heap memory segment, possibly executing code on the machine. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
dnsmasq	24.04 LTS noble	Fixed 2.82-1ubuntu2
	23.10 mantic	Fixed 2.82-1ubuntu2
	23.04 lunar	Fixed 2.82-1ubuntu2
	22.10 kinetic	Fixed 2.82-1ubuntu2
	22.04 LTS jammy	Fixed 2.82-1ubuntu2
	21.10 impish	Fixed 2.82-1ubuntu2
	21.04 hirsute	Fixed 2.82-1ubuntu2
	20.10 groovy	Fixed 2.82-1ubuntu1.1
	20.04 LTS focal	Fixed 2.80-1.1ubuntu1.2
	18.04 LTS bionic	Fixed 2.79-1ubuntu0.2
	16.04 LTS xenial	Fixed 2.75-1ubuntu0.16.04.7
	14.04 LTS trusty	Needs evaluation

Severity score breakdown

Parameter	Value
Base score	8.1 · High
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)