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CVE-2021-45960 libexpat

Affected softwarelibexpat
Severity8.8 High CVSS 3.1 3 scores
WeaknessCWE-682
Published1 Jan 2022
Updated14 Oct 2026

Description

In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).

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 4.7% 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

8.8 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:L/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 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H NVD Primary published
CVSS 3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CISA-ADP Secondary
CVSS 2.0 9.0 none AV:N/AC:L/Au:S/C:C/I:C/A:C NVD Primary

Affected software and releases

Products and versions

8 products, 12 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 10.0 · 11.0
nvd libexpat project libexpat generic < 2.4.3
nvd netapp active iq unified manager 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 Exploit, Mailing List, Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1217609 Issue Tracking, Permissions Required, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf Patch, Third Party Advisory
https://github.com/libexpat/libexpat/issues/531 Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/libexpat/libexpat/pull/534 Patch, Third Party Advisory
https://security.gentoo.org/glsa/202209-24 Third Party Advisory
https://security.netapp.com/advisory/ntap-20220121-0004/ Third Party Advisory
https://www.debian.org/security/2022/dsa-5073 Issue Tracking, Third Party Advisory
https://www.tenable.com/security/tns-2022-05 Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

Timeline

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