HIGH
CVE-2021-46143
CWE-190Published: January 6, 2022· Updated: Jun 17, 2026
7.8
CVSS v3.1
Official Description
In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.
Technical Analysis
CVE-2021-46143 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected Vendors & Products
libexpat_project1 product(s)
libexpat
netapp5 product(s)
active iq unified managerclustered data ontaphci baseboard management controlleroncommand workflow automationsolidfire \& hci management node
siemens1 product(s)
sinema remote connect server
tenable1 product(s)
nessus
Source: NVD CPE · 10 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 (16)
→
http://www.openwall.com/lists/oss-security/2022/01/17/3Mailing List · Patch · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatch · Third Party Advisory
→
https://github.com/libexpat/libexpat/issues/532Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/libexpat/libexpat/pull/538Patch · Third Party Advisory
→
https://security.gentoo.org/glsa/202209-24Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220121-0006/Third Party Advisory
→
https://www.debian.org/security/2022/dsa-5073Third Party Advisory
→
https://www.tenable.com/security/tns-2022-05Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2022/01/17/3Mailing List · Patch · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatch · Third Party Advisory
→
https://github.com/libexpat/libexpat/issues/532Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://github.com/libexpat/libexpat/pull/538Patch · Third Party Advisory
→
https://security.gentoo.org/glsa/202209-24Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20220121-0006/Third Party Advisory
→
https://www.debian.org/security/2022/dsa-5073Third Party Advisory
Quick Facts
CVE IDCVE-2021-46143
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-190
CISA KEVNo
Affected4 vendor(s)
PublishedJan 6, 2022
Related CVEs (CWE-190)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-46143 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.