HIGH
CVE-2022-43680
CWE-416Published: October 24, 2022· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
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.
Technical Analysis
CVE-2022-43680 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
libexpat_project1 product(s)
libexpat
netapp15 product(s)
h300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh410s firmwareh410sh410c firmwareh410cactive iq unified manageroncommand workflow automation+3
Source: NVD CPE · 21 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (30)
→
http://www.openwall.com/lists/oss-security/2023/12/28/5Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2024/01/03/5Mailing List · Third Party Advisory
→
https://github.com/libexpat/libexpat/issues/649Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/libexpat/libexpat/pull/616Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/libexpat/libexpat/pull/650Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/10/msg00033.htmlMailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AJ5VY2VYXE4WTRGQ6LMGLF6FV3SY37YE/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY4OPSIB33ETNUXZY2UPZ4NGQ3OKDY4D/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DPQVIF6TOJNY2T3ZZETFKR4G34FFREBQ/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FFCOMBSOJKLIKCGCJWHLJXO4EVYBG7AR/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUJ2BULJTZ2BMSKQHB6US674P55UCWWS/Mailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XG5XOOB7CD55CEE6OJYKSACSIMQ4RWQ6/Mailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202210-38Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20221118-0007/Third Party Advisory
→
https://www.debian.org/security/2022/dsa-5266Third Party Advisory
Quick Facts
CVE IDCVE-2022-43680
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-416
CISA KEVNo
Affected4 vendor(s)
PublishedOct 24, 2022
Related CVEs (CWE-416)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2022-43680 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.