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).
Fix
Public exploits 2
- Trinadh465/external_lib_AOSP10_r33_CVE-2021-45960_CVE-2021-46143- PoC on GitHub
- nanopathi/external_expat_AOSP10_r33_CVE-2021-45960 PoC on GitHub
Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.
Patch, vendor advisory and mitigation references on NVD 6
- 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://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
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.8 · libexpat_project, tenable, debianNVD modified 2026-10-14 13:17
Affected (CPE criteria) 11
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*cpe:2.3:a:netapp:hci_baseboard_management_controller:h610c:*:*:*:*:*:*:*cpe:2.3:a:netapp:hci_baseboard_management_controller:h610s:*:*:*:*:*:*:*cpe:2.3:a:netapp:hci_baseboard_management_controller:h615c:*:*:*:*:*:*:*cpe:2.3:a:netapp:oncommand_workflow_automation:-:*:*:*:*:*:*:*cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
References 20
- 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
- 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
- https://cert-portal.siemens.com/productcert/html/ssa-484086.html