CVE-2021-45960
HIGH 8.8EPSS 4.3%
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).
- CVSS v3.1 NVD
- 8.8 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS v2.0 NVD
- 9.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C - EPSS
- 4.35% chance of exploitation in the next 30 days, 91st percentile
- Published
- 2022-01-01
- Updated
- 2026-10-14
Proof-of-concept exploits (2)
- Trinadh465/external_lib_AOSP10_r33_CVE-2021-45960_CVE-2021-46143-0★ · 2022-05-25
- nanopathi/external_expat_AOSP10_r33_CVE-2021-459600★ · 2022-04-11
Security advisories
- 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
- libexpat/libexpat/issues/531
- 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