Home/CVE/build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.
CVE

CVE-2022-22823

build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.

build_model in xmlparse.c in Expat (aka libexpat) before 2.4.3 has an integer overflow.

CRITICAL · CVSS 9.8 EPSS 0.00431
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-190Integer Overflow or Wraparound
CWE-190Integer Overflow or Wraparound
▤

Affected Products & Versions

5
libexpat project libexpat< 2.4.3
tenable nessus< 8.15.3
tenable nessus>= 10.0.0 and < 10.1.1
debian linuxall versions
siemens sinema remote connect server< 3.1
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Jan 2022 · 02:12 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

25
rhsaRHSA-2025:22785Important
rhsaRHSA-2025:22871Important
usnUSN-7199-1
suse-csafopenSUSE-SU-2024:11762-1
siemens-csafSSA-398330
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2022/01/17/3Mailing ListThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfPatchThird Party Advisory
https://github.com/libexpat/libexpat/pull/539Third Party Advisory
https://security.gentoo.org/glsa/202209-24Third Party Advisory
https://www.debian.org/security/2022/dsa-5073Third Party Advisory
https://www.tenable.com/security/tns-2022-05Third Party Advisory
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