Use After Free in Libexpat Project
CVE-2022-43680
In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.032 (88.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.032 · change: +0.007
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/libexpat/libexpat/pull/650 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- github.com/libexpat/libexpat/issues/649 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- github.com/libexpat/libexpat/pull/616 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- lists.debian.org/debian-lts-announce/2022/10/msg00033.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2022/dsa-5266 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202210-38 (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-43680?
- CVE-2022-43680 is a high-severity vulnerability in Libexpat Project, classified under Use After Free. CVSS score: 7.5/10. Published 2022-10-24.
- How severe is CVE-2022-43680?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2022-43680 known to be exploited?
- 20 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.