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CVE-2021-45960

Date: January 1, 2022

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).

Language: C

Severity Score

Related Resources (15)

https://github.com/libexpat/libexpat/pull/534
https://security.gentoo.org/glsa/202209-24
https://github.com/libexpat/libexpat/issues/531
https://access.redhat.com/security/cve/CVE-2021-45960
https://www.tenable.com/security/tns-2022-05
https://security.netapp.com/advisory/ntap-20220121-0004/
http://www.openwall.com/lists/oss-security/2022/01/17/3
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-45960
https://bugzilla.mozilla.org/show_bug.cgi?id=1217609
https://security.alpinelinux.org/vuln/CVE-2021-45960
https://nvd.nist.gov/vuln/detail/CVE-2021-45960
https://security-tracker.debian.org/tracker/CVE-2021-45960
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
https://www.debian.org/security/2022/dsa-5073
https://www.mend.io/vulnerability-database/CVE-2021-45960

Severity Score

Weakness Type (CWE)

Incorrect Calculation

CWE-682

Uncontrolled Resource Consumption ('Resource Exhaustion')

CWE-400

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): SINGLE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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