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CVE-2021-46143 libexpat

Affected softwarelibexpat
Severity8.1 High CVSS 3.1 3 scores
WeaknessInteger overflow (CWE-190)
Published6 Jan 2022
Updated14 Oct 2026

Description

In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: no, technical impact: total.
  • Indexed PoC none indexed
  • EPSS 4.5% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

8.1 HIGH v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 8.1 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H cve@mitre.org Secondary published
CVSS 3.1 7.8 HIGH CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H NVD Primary
CVSS 2.0 6.8 none AV:N/AC:M/Au:N/C:P/I:P/A:P NVD Primary

Affected software and releases

Products and versions

8 products, 11 version entries
SourceVendorProductSchemeAffected versions
nvd libexpat project libexpat generic < 2.4.3
nvd netapp active iq unified manager generic any version
nvd netapp clustered data ontap generic any version
nvd netapp hci baseboard management controller generic h610c · h610s · h615c
nvd netapp oncommand workflow automation generic any version
nvd netapp solidfire \& hci management node generic any version
nvd siemens sinema remote connect server generic < 3.1
nvd tenable nessus generic < 8.15.3 · ≥ 10.0.0 and < 10.1.1

References

URLTags
http://www.openwall.com/lists/oss-security/2022/01/17/3 Mailing List, Patch, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf Patch, Third Party Advisory
https://github.com/libexpat/libexpat/issues/532 Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/libexpat/libexpat/pull/538 Patch, Third Party Advisory
https://security.gentoo.org/glsa/202209-24 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220121-0006/ Third Party Advisory
https://www.debian.org/security/2022/dsa-5073 Third Party Advisory
https://www.tenable.com/security/tns-2022-05 Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://cert-portal.siemens.com/productcert/html/ssa-484086.html

Timeline

Published2022-01-06By the CVE Program.
NVD record modified2026-10-14NVD's own last-modified date for this record.