CVE-2021-45960

moderate-risk
Published 2022-01-01

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).

Do I need to act?

-
0.35% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (11)

Affected Vendors

Debian Siemens Netapp Libexpat Project Tenable

References (18)

Exploit http://www.openwall.com/lists/oss-security/2022/01/17/3
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1217609
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
Exploit https://github.com/libexpat/libexpat/issues/531
Patch https://github.com/libexpat/libexpat/pull/534
Third Party Advisory https://security.gentoo.org/glsa/202209-24
Third Party Advisory https://security.netapp.com/advisory/ntap-20220121-0004/
Issue Tracking https://www.debian.org/security/2022/dsa-5073
Third Party Advisory https://www.tenable.com/security/tns-2022-05
Exploit http://www.openwall.com/lists/oss-security/2022/01/17/3
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1217609
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
Exploit https://github.com/libexpat/libexpat/issues/531
Patch https://github.com/libexpat/libexpat/pull/534
Third Party Advisory https://security.gentoo.org/glsa/202209-24
Third Party Advisory https://security.netapp.com/advisory/ntap-20220121-0004/
Issue Tracking https://www.debian.org/security/2022/dsa-5073
Third Party Advisory https://www.tenable.com/security/tns-2022-05
47
/ 100
moderate-risk
Severity 30/34 · Critical
Exploitability 1/34 · Minimal
Exposure 16/34 · Moderate