Home/CVE/In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can le
CVE

CVE-2021-45960

In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can le

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).

HIGH · CVSS 8.8 EPSS 0.00316
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-682Incorrect Calculation
CWE-682Incorrect Calculation
▤

Affected Products & Versions

9
libexpat project libexpat< 2.4.3
tenable nessus< 8.15.3
tenable nessus>= 10.0.0 and < 10.1.1
debian linuxall versions
siemens sinema remote connect server< 3.1
netapp active iq unified managerall versions
netapp hci baseboard management controllerall versions
netapp oncommand workflow automationall versions
⚠

Public Exploits & PoCs

1
pocgithub.com · issues/531github.com
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Jan 2022 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

17
rhsaRHSA-2025:22785Important
rhsaRHSA-2025:22871Important
suse-csafopenSUSE-SU-2024:11762-1
siemens-csafSSA-398330
siemens-csafSSA-484086
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2022/01/17/3ExploitMailing ListThird Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1217609Issue TrackingPermissions RequiredThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatchThird Party Advisory
https://github.com/libexpat/libexpat/pull/534PatchThird Party Advisory
https://security.gentoo.org/glsa/202209-24Third Party Advisory
https://security.netapp.com/advisory/ntap-20220121-0004/Third Party Advisory
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