Is CVE-2022-22822 being actively exploited?

CVE-2022-22822 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2022-22822?

CVE-2022-22822 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2022-22822

CRITICAL · CVSS 9.8EPSS 4.8%EU EUVD

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

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-190
EPSS score: 4.8% (92th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2022-27960)
Published: January 10, 2022
NVD last modified: October 14, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2022-27960 in the EU Vulnerability Database. Last updated in EUVD on October 14, 2026.

View on the EU Vulnerability Database

Affected products

debian / debian linux
debian / debian linux
libexpat project / libexpat
siemens / sinema remote connect server
tenable / nessus

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Nessus Manager 8.11.1 - Tenable, Inc. - Common Criteria CCEVS-VR-VID-11067-2020 - archived
Tenable SecurityCenter 4.4 (SC) and Components: 3D Tool 2.0.1 Log Correlation Engine 3.6 (LCE), Passive Vulnerability Scanner 3.6 (PVS), Nessus 5.0.1, and xTool 2.1 - Tenable Network Security, Inc. - Common Criteria CCEVS-VR-VID-10443-2012 - archived

References

http://www.openwall.com/lists/oss-security/2022/01/17/3(Mailing List, Release Notes, Third Party Advisory)
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://cert-portal.siemens.com/productcert/html/ssa-484086.html
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf(Patch, Third Party Advisory)
https://github.com/libexpat/libexpat/pull/539(Patch, Third Party Advisory)
https://security.gentoo.org/glsa/202209-24(Third Party Advisory)
https://www.debian.org/security/2022/dsa-5073(Third Party Advisory)
https://www.tenable.com/security/tns-2022-05(Third Party Advisory)

Last updated October 15, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain