VulnerabilityModified
CVE-2021-45960
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).
HIGH 8.8EPSS 4.23%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.23%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.23% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-682
- Affected
- libexpat project/libexpat · tenable/nessus · debian/debian linux · siemens/sinema remote connect server · netapp/active iq unified manager · netapp/hci baseboard management controller · netapp/oncommand workflow automation · netapp/solidfire \& hci management node
- Source
- cve@mitre.org
References
- http://www.openwall.com/lists/oss-security/2022/01/17/3Exploit, Mailing List, Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1217609Issue Tracking, Permissions Required, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatch, Third Party Advisory
- https://github.com/libexpat/libexpat/issues/531Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/libexpat/libexpat/pull/534Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202209-24Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220121-0004/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5073Issue Tracking, Third Party Advisory
- https://www.tenable.com/security/tns-2022-05Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/01/17/3Exploit, Mailing List, Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1217609Issue Tracking, Permissions Required, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatch, Third Party Advisory
- https://github.com/libexpat/libexpat/issues/531Exploit, Issue Tracking, Patch, Third Party Advisory
- https://github.com/libexpat/libexpat/pull/534Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202209-24Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220121-0004/Third Party Advisory
- https://www.debian.org/security/2022/dsa-5073Issue Tracking, Third Party Advisory
- https://www.tenable.com/security/tns-2022-05Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.