What’s Vulnerable › Vulnerabilities

CVE-2021-45960

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-01 · updated 2026-10-14
• Weakness: CWE-682

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).

Affected products

• Debian Linux: 10.0, 11.0
• libexpat project libexpat: before 2.4.3 — fixed in 2.4.3
• Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
• NetApp Hci Baseboard Management Controller: h610c, h610s, h615c
• NetApp OnCommand Workflow Automation: all versions
• NetApp Solidfire & Hci Management Node: all versions
• Siemens SINEMA Remote Connect Server: before 3.1 — fixed in 3.1
• Tenable Nessus: before 8.15.3; from 10.0.0 before 10.1.1 — fixed in 10.1.1, 8.15.3

How to fix

Upgrade to a fixed version: libexpat project libexpat 2.4.3; Siemens SINEMA Remote Connect Server 3.1; Tenable Nessus 10.1.1, 8.15.3. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2022/01/17/3
• https://bugzilla.mozilla.org/show_bug.cgi?id=1217609
• https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
• https://github.com/libexpat/libexpat/issues/531
• https://github.com/libexpat/libexpat/pull/534
• https://security.gentoo.org/glsa/202209-24
• https://security.netapp.com/advisory/ntap-20220121-0004/
• https://www.debian.org/security/2022/dsa-5073
• https://www.tenable.com/security/tns-2022-05
• http://www.openwall.com/lists/oss-security/2022/01/17/3
• https://bugzilla.mozilla.org/show_bug.cgi?id=1217609
• https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf

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