CVE-2021-3537

Published: 14 May 2021

A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.

Priority

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package	Release	Status
libxml2 Launchpad, Ubuntu, Debian	hirsute	Released (2.9.10+dfsg-6.3ubuntu0.1)
	jammy	Not vulnerable (2.9.10+dfsg-6.7)
	trusty	Released (2.9.1+dfsg1-3ubuntu4.13+esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	xenial	Released (2.9.3+dfsg1-1ubuntu0.7+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	impish	Not vulnerable (2.9.10+dfsg-6.7)
	bionic	Released (2.9.4+dfsg1-6.1ubuntu1.4)
	focal	Released (2.9.10+dfsg-5ubuntu0.20.04.1)
	groovy	Released (2.9.10+dfsg-5ubuntu0.20.10.2)
	upstream	Released (2.9.10+dfsg-6.6, 2.9.11)

Severity score breakdown

Parameter	Value
Base score	5.9
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988123

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