Is CVE-2021-3537 in the CISA KEV catalog?

No. CVE-2021-3537 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3537?

CVE-2021-3537 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2021-3537?

CVE-2021-3537 has an EPSS score of 3.50% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3537?

Upgrade libxml2 on debian 11 to 2.9.10+dfsg-6.6 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3537

MEDIUMEPSS 88th pctl

5.9

CVSS v3

NVD

Description

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.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

libxml2Debian

Fixed in:2.9.10+dfsg-6.6CVE-2021-3537

libxml2Ubuntu

Fixed in:2.9.1+dfsg1-3ubuntu4.13+esm2USN-4991-1

Fixed in:2.9.3+dfsg1-1ubuntu0.7+esm1USN-4991-1

Fixed in:2.9.4+dfsg1-6.1ubuntu1.4USN-4991-1

Fixed in:2.9.10+dfsg-5ubuntu0.20.04.1USN-4991-1

libxml2-utilsUbuntu

Fixed in:2.9.1+dfsg1-3ubuntu4.13+esm2USN-4991-1

Fixed in:2.9.3+dfsg1-1ubuntu0.7+esm1USN-4991-1

Fixed in:2.9.4+dfsg1-6.1ubuntu1.4USN-4991-1

Fixed in:2.9.10+dfsg-5ubuntu0.20.04.1USN-4991-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

3.50%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch3

Third-Party Advisory3

Other references3

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

Embed a live status badge for CVE-2021-3537

Markdown

[![CVE-2021-3537](https://tridentstack.com/cve/badge/CVE-2021-3537.svg)](https://tridentstack.com/cve/CVE-2021-3537)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-3537"><img src="https://tridentstack.com/cve/badge/CVE-2021-3537.svg" alt="CVE-2021-3537"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.