CVE-2021-45960: Debian Linux

High severity, CVSS 8.8. EPSS: 4.2% chance of exploitation in the next 30 days.

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 Debian Linux: version 10.0 only; version 11.0 only
• Libexpat Project Libexpat: before 2.4.3 (fixed in 2.4.3)
• Netapp Active Iq Unified Manager: affected versions not specified
• Netapp Hci Baseboard Management Controller: version h610c only; version h610s only; version h615c only
• Netapp Oncommand Workflow Automation: affected versions not specified
• Netapp Solidfire & Hci Management Node: affected versions not specified
• Siemens Sinema Remote Connect Server: before 3.1 (fixed in 3.1)
• Tenable Nessus: before 8.15.3 (fixed in 8.15.3); from 10.0.0, before 10.1.1 (fixed in 10.1.1)

Published 2022-01-01. Last modified 2026-06-17.