CVE-2021-20266

Publication date 30 April 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was found in RPM's hdrblobInit() in lib/header.c. This flaw allows an attacker who can modify the rpmdb to cause an out-of-bounds read. The highest threat from this vulnerability is to system availability.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
rpm	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Fixed 4.14.2.1+dfsg1-1ubuntu0.1~esm1
	18.04 LTS bionic	Fixed 4.14.1+dfsg1-2ubuntu0.1~esm1
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

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Notes

seth-arnold

Only debugedit and librpmio9 binary packages are in main, and triaged with view to how they are used in the build process as described in https://bugs.launchpad.net/ubuntu/+source/rpm/+bug/1913871

Severity score breakdown

Parameter	Value
Base score	4.9 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	High
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-5273-1
RPM Package Manager vulnerabilities
21 July 2022