CVE-2022-25235

Name: CVE-2022-25235
Creator: NVD / NIST
Published: 2022-02-16T01:15:07.607+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 4.92%

Last modified Jun 17, 2026

CVE-2022-25235 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.. EPSS estimates a 4.92% chance of exploitation in the next 30 days.

Description

xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

4.92%

91.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libexpat Project	Libexpat	< 2.4.5
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0
Fedoraproject	Fedora	34
Fedoraproject	Fedora	35
Oracle	Http Server	12.2.1.3.0
Oracle	Http Server	12.2.1.4.0
Oracle	Zfs Storage Appliance Kit	8.8
Siemens	Sinema Remote Connect Server	< 3.1

References

http://www.openwall.com/lists/oss-security/2022/02/19/1Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfThird Party Advisory
https://github.com/libexpat/libexpat/pull/562Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00007.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/
https://security.gentoo.org/glsa/202209-24Third Party Advisory
https://security.netapp.com/advisory/ntap-20220303-0008/Third Party Advisory
https://www.debian.org/security/2022/dsa-5085Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/02/19/1Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfThird Party Advisory
https://github.com/libexpat/libexpat/pull/562Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00007.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/
https://security.gentoo.org/glsa/202209-24Third Party Advisory
https://security.netapp.com/advisory/ntap-20220303-0008/Third Party Advisory
https://www.debian.org/security/2022/dsa-5085Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory

Timeline

Published: Feb 16, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-25235?

xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.

How severe is CVE-2022-25235?

CVE-2022-25235 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.92% probability of exploitation in the next 30 days.

How do I fix CVE-2022-25235?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-25235?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST