Skip to content
Fencer Vulns
critical 9.8

CVE-2022-25236 in the critical feed json

xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator...

published 2022-02-16 4 y ago modified 2026-10-14 25 d ago also EUVD-2022-29934 , JLSEC-2025-53

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
35.3%
EPSS 35.3% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs.

Patch / fix

  • julia Expat_jll 2.4.8+0
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • expat Debian 14, Debian 13, Debian 12 2.4.5-1

debian advisories DEBIAN-CVE-2022-25236

  • expat Ubuntu 18.04 LTS 2.2.5-3ubuntu0.4
  • expat Ubuntu 20.04 LTS 2.2.9-1ubuntu0.2
  • firefox Ubuntu 22.04 LTS 1:1snap1-0ubuntu1
  • libxmltok Ubuntu 24.04 LTS 1.2-4.1ubuntu1
  • ayttm Ubuntu Pro 16.04 LTS 0.6.3-3ubuntu0.1~esm1
  • coin3 Ubuntu Pro 14.04 LTS 3.1.4~abc9f50-4ubuntu2+esm2
  • coin3 Ubuntu Pro 16.04 LTS 3.1.4~abc9f50+dfsg1-1ubuntu0.1~esm2
  • coin3 Ubuntu Pro 18.04 LTS 3.1.4~abc9f50+dfsg3-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2022-25236

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • redhat-virtualization-host RHEL 7 4.3.22-20220330.1.el7_9
  • redhat-virtualization-host-image-update RHEL 7 4.3.22-20220330.1.el7_9
  • mingw-expat RHEL 8 2.4.8-1.el8
  • mingw32-expat RHEL 8 2.4.8-1.el8
  • mingw64-expat RHEL 8 2.4.8-1.el8
  • thunderbird RHEL 8 91.7.0-2.el8_5
  • thunderbird RHEL 7 91.7.0-2.el7_9
  • expat RHEL 7 2.1.0-14.el7_9

red hat advisories RHSA-2022:1263RHSA-2022:7811RHSA-2022:0847RHSA-2022:1309RHSA-2022:0845RHSA-2022:0850

  • python311 Linux Micro 6.1 3.11.12-slfo.1.1_1.1
  • python311-core Linux Micro 6.1 3.11.12-slfo.1.1_1.1
  • python311 Linux Micro 6.0 3.11.11-1.1
  • python311-core Linux Micro 6.0 3.11.11-1.1
  • python311 Linux Micro 6.0 3.11.8-3.1
  • python311-core Linux Micro 6.0 3.11.8-3.1
  • python311 SLE Module for Python 3 15 SP5, SLE Module for Public Cloud 15 SP4, SLE High Performance Computing 15 SP4-ESPOS +4 more 3.11.8-150400.9.23.1
  • python311-core SLE Module for Python 3 15 SP5, SLE Module for Public Cloud 15 SP4, SLE High Performance Computing 15 SP4-ESPOS +4 more 3.11.8-150400.9.23.1

suse advisories SUSE-SU-2025:20374-1SUSE-SU-2025:20154-1SUSE-SU-2025:20025-1SUSE-SU-2024:0782-2SUSE-SU-2024:0784-1SUSE-SU-2024:0782-1

  • python315 openSUSE Tumbleweed 3.15.0~a1-1.1
  • python314 openSUSE Tumbleweed 3.14.0~a1-1.1
  • python313 openSUSE Tumbleweed 3.13.0~b3-1.1
  • expat openSUSE Tumbleweed 2.4.6-1.1
  • python39 openSUSE Tumbleweed 3.9.13-2.1
  • python310 openSUSE Tumbleweed 3.10.5-2.1
  • python311 openSUSE Tumbleweed 3.11.0rc2-1.1
  • python38 openSUSE Tumbleweed 3.8.14-1.1

opensuse advisories openSUSE-SU-2025:15713-1openSUSE-SU-2024:14434-1openSUSE-SU-2024:14109-1openSUSE-SU-2024:11866-1openSUSE-SU-2024:12150-1openSUSE-SU-2024:12152-1

  • mingw32-expat AlmaLinux 8 2.4.8-1.el8
  • mingw64-expat AlmaLinux 8 2.4.8-1.el8
  • expat AlmaLinux 8 2.2.5-8.el8_6.2
  • thunderbird AlmaLinux 8 91.7.0-2.el8_5.alma
  • thunderbird AlmaLinux 8 91.7.0-2.el8_5.alma.plus
  • firefox AlmaLinux 8 91.7.0-3.el8_5.alma

almalinux advisories ALSA-2022:7811ALSA-2022:0951ALSA-2022:0845ALSA-2022:0818

  • expat Rocky Linux 8 2.2.5-4.el8_5.3
  • thunderbird Rocky Linux 8 91.7.0-2.el8_5
  • firefox Rocky Linux 8 91.7.0-3.el8_5

rocky linux advisories RLSA-2022:0951RLSA-2022:0845RLSA-2022:0818

  • expat Alpine 3.12 2.2.10-r2
  • expat Alpine 3.13 2.2.10-r4
  • expat Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 2.4.5-r0

alpine advisories ALPINE-CVE-2022-25236

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • expat CBL-Mariner 2.0 2.4.8-1

azure linux advisories AZL-8604

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-25236 updated cvss 9.8

expat: Namespace-separator characters in "xmlns[:prefix]" attribute values can lead to arbitrary code execution

  • Red Hat Enterprise Linux 8 firefox, thunderbird
    affected: workaround, no fix available “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.”
  • Red Hat CodeReady Linux Builder (v. 8) mingw-expat 2.4.8-1.el8, mingw32-expat 2.4.8-1.el8, mingw64-expat 2.4.8-1.el8
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:7811
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 91.7.0-3.el8_5, thunderbird 91.7.0-2.el8_5
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:0818
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 91.7.0-3.el8_1, thunderbird 91.7.0-2.el8_1
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:0815
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 91.7.0-3.el8_2, thunderbird 91.7.0-2.el8_2
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:0816
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 91.7.0-3.el8_4, thunderbird 91.7.0-2.el8_4
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:0817
  • Red Hat Enterprise Linux BaseOS (v. 8) expat 2.2.5-4.el8_5.3
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:0951
  • Red Hat Enterprise Linux BaseOS E4S (v. 8.1) expat 2.2.5-3.el8_1.1
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1068
show 10 more
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) expat 2.2.5-3.el8_2.2
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1070
  • Red Hat Enterprise Linux BaseOS EUS (v.8.4) expat 2.2.5-4.el8_4.2
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1012
  • Red Hat Enterprise Linux Client (v. 7) expat 2.1.0-14.el7_9, firefox 91.7.0-3.el7_9, thunderbird 91.7.0-2.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 91.7.0-3.el7_9 Red Hat Enterprise Linux ComputeNode Optional (v. 7) expat-devel 2.1.0-14.el7_9, expat-static 2.1.0-14.el7_9, expat-debuginfo 2.1.0-14.el7_9
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1069
  • Red Hat Enterprise Linux Server (v. 6 ELS) expat 2.0.1-14.el6_10
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1309
  • Red Hat Enterprise Linux Server (v. 7) expat 2.1.0-14.el7_9, firefox 91.7.0-3.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 91.7.0-3.el7_9, thunderbird 91.7.0-2.el7_9 Red Hat Enterprise Linux Workstation (v. 7) expat 2.1.0-14.el7_9, firefox 91.7.0-3.el7_9, thunderbird 91.7.0-2.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 91.7.0-3.el7_9
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1069
  • Red Hat JBoss Core Services
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:7144
  • Red Hat Virtualization 4 Hypervisor for RHEL 7 redhat-virtualization-host 4.3.22-20220330.1.el7_9, redhat-virtualization-host-image-update 4.3.22-20220330.1.el7_9
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1263
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 redhat-virtualization-host 4.4.10-202203211649_8.5, redhat-virtualization-host-image-update 4.4.10-202203211649_8.5
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1053
  • Red Hat RHEL 7-based RHEV-H for RHEV 4 (build requirements) redhat-virtualization-host 4.3.22-20220330.1.el7_9, redhat-virtualization-host-image-update 4.3.22-20220330.1.el7_9
    fixed: vendor fix “There is no known mitigation other than restricting applications using the expat library from processing untrusted XML content. Please update the affected packages as soon as possible.” RHSA-2022:1263
  • Red Hat Enterprise Linux 8 xmlrpc-c, xmlrpc-c-c++, xmlrpc-c-client, xmlrpc-c-client++ Red Hat Enterprise Linux 9 expat, firefox, xmlrpc-c, firefox-x11, thunderbird, xmlrpc-c-c++, +2 more Red Hat Virtualization 4 Hypervisor for RHEL 8 elfutils 0.185-1.el8, elfutils-debuginfod-client 0.185-1.el8 Red Hat RHEL 7-based RHEV-H for RHEV 4 (build requirements) redhat-release-virtualization-host 4.3.22-1.el7ev, redhat-virtualization-host-productimg 4.3.22-1.el7, redhat-virtualization-host-image-update-placeholder 4.3.22-1.el7ev Red Hat RHEL 8-based RHEV-H for RHEV 4 (build requirements) redhat-release-virtualization-host 4.4.10-3.el8ev, redhat-release-virtualization-host-content 4.4.10-3.el8ev, redhat-virtualization-host-image-update-placeholder 4.4.10-3.el8ev
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 9.8

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-22-167-17 updated cvss 9.8

Siemens OpenSSL Affecting Industrial Products

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-23-278-01 updated cvss 9.8

Hitachi Energy AFS65x,AFF66x, AFS67x, and AFR67x Series Products

  • Hitachi Energy AFF66X FW <= 03.0.02 Hitachi Energy AFR677 Hitachi Energy AFS65X Hitachi Energy AFS66X-B Hitachi Energy AFS66X-S Hitachi Energy AFS67X
    +2 more products
    Hitachi Energy AFS660-C Hitachi Energy AFS670-V20
    affected: vendor fix, mitigation “Hitachi energy recommends the following actions:” publisher.hitachienergy.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
18 mo ago

Exploit prediction

35.27% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
OSV 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
julia Expat_jll
<2.4.8+0
2.4.8+0

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-668 Exposure of Resource to Wrong Sphere

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.