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Vulnerabilities

Vulnerability · CVE-2021-3516

There's a flaw in libxml2's xmllint in versions before 2.9.11.

Published Jun 1, 2021 · catalog updated Oct 14, 2026 · There's a flaw in

Check if you run it

No confirmed exploitation is on record for CVE-2021-3516. EPSS is 2.04%. Act only if a listed version of There's a flaw in is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (There's a flaw in).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.04%
Remediation
Advisory link
Affected products
cpe debian/debian linux · cpe fedoraproject/fedora · cpe netapp/clustered data ontap · cpe oracle/zfs storage appliance kit · cpe redhat/enterprise linux · cpe redhat/jboss core services

There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe debian/debian linux9.0
  • cpe fedoraproject/fedora33
  • cpe fedoraproject/fedora34
  • cpe netapp/clustered data ontapversion unspecified
  • cpe oracle/zfs storage appliance kit8.8
  • cpe redhat/enterprise linux6.0
  • cpe redhat/enterprise linux7.0
  • cpe redhat/enterprise linux8.0
  • cpe redhat/jboss core servicesversion unspecified
  • cpe xmlsoft/xmllintversion unspecified

How to fix CVE-2021-3516

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-3516. EPSS is 2.04%. Act only if a listed version of There's a flaw in is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 9.0; oracle/zfs storage appliance kit 8.8; redhat/enterprise linux 6.0; redhat/enterprise linux 7.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 2.04%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 1, 2021 · NIST NVD

    Detected

    There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

  2. Oct 14, 2026 · NIST NVD

    Updated

    There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

Sources

  • CVE.orgVulnerability recordCVE-2021-3516

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-3516

    30-day exploitation probability 2.0%

    first.org
  • NIST NVDVulnerability recordCVE-2021-3516

    There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.