Skip to content
Fencer Vulns
medium 6.5

CVE-2023-28484 json

In libxml2 before 2.10.4, parsing of certain invalid XSD schemas can lead to a NULL pointer...

published 2023-04-24 3 y ago modified 2026-10-14 25 d ago also EUVD-2023-32154 , JLSEC-2025-79

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

In libxml2 before 2.10.4, parsing of certain invalid XSD schemas can lead to a NULL pointer dereference and subsequently a segfault. This occurs in xmlSchemaFixupComplexType in xmlschemas.c.

Patch / fix

  • julia XML2_jll 2.10.4+0, 2.12.0+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
  • libxml2 Debian 14, Debian 13, Debian 12 2.9.14+dfsg-1.2

debian advisories DEBIAN-CVE-2023-28484

  • libxml2 Ubuntu 18.04 LTS 2.9.4+dfsg1-6.1ubuntu1.9
  • libxml2 Ubuntu 20.04 LTS 2.9.10+dfsg-5ubuntu0.20.04.6
  • libxml2 Ubuntu 22.04 LTS 2.9.13+dfsg-1ubuntu0.3
  • libxml2 Ubuntu Pro 14.04 LTS 2.9.1+dfsg1-3ubuntu4.13+esm5
  • libxml2 Ubuntu Pro 16.04 LTS 2.9.3+dfsg1-1ubuntu0.7+esm5

ubuntu advisories UBUNTU-CVE-2023-28484

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

  • libxml2 RHEL 8 2.9.7-16.el8_8.1
  • python3-libxml2 RHEL 8 2.9.7-16.el8_8.1
  • libxml2 RHEL 9 2.9.13-3.el9_2.1
  • python3-libxml2 RHEL 9 2.9.13-3.el9_2.1
  • libxml2 RHEL 8.6 EUS 2.9.7-13.el8_6.4
  • python3-libxml2 RHEL 8.6 EUS 2.9.7-13.el8_6.4

red hat advisories RHSA-2024:0413RHSA-2023:4529RHSA-2023:4349

  • libxml2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.9.4-46.65.1
  • python-libxml2 SLES for SAP 12 SP5, SLES 12 SP5 2.9.4-46.65.1
  • libxml2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.9.4-46.62.1
  • python-libxml2 SLES for SAP 12 SP5, SLES 12 SP5 2.9.4-46.62.1
  • libxml2 SLE Module for Basesystem 15 SP4, SLE Micro 5.4, SLE Micro 5.3 +2 more 2.9.14-150400.5.16.1
  • libxml2-python SLE Module for Basesystem 15 SP4, SLE Micro 5.4, SLE Micro 5.3 +2 more 2.9.14-150400.5.16.1
  • libxml2 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +14 more 2.9.7-150000.3.57.1
  • python-libxml2-python SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +14 more 2.9.7-150000.3.57.1

suse advisories SUSE-SU-2023:3665-1SUSE-SU-2023:2054-1SUSE-SU-2023:2053-1SUSE-SU-2023:2048-1

  • libxml2 openSUSE Tumbleweed 2.10.4-1.1

opensuse advisories openSUSE-SU-2024:12877-1

  • libxml2 AlmaLinux 8 2.9.7-16.el8_8.1
  • python3-libxml2 AlmaLinux 8 2.9.7-16.el8_8.1
  • libxml2 AlmaLinux 9 2.9.13-3.el9_2.1
  • python3-libxml2 AlmaLinux 9 2.9.13-3.el9_2.1

almalinux advisories ALSA-2023:4529ALSA-2023:4349

  • libxml2 Rocky Linux 8 2.9.7-16.el8_8.1

rocky linux advisories RLSA-2023:4529

  • libxml2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 2.10.4-r0

alpine advisories ALPINE-CVE-2023-28484

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

  • libxml2 CBL-Mariner 2.0 2.10.4-1

azure linux advisories AZL-26281

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-2023-28484 updated cvss 5.9

libxml2: NULL dereference in xmlSchemaFixupComplexType

  • Red Hat Enterprise Linux 6 libxml2, libxml2-python Red Hat Enterprise Linux 7 libxml2, libxml2-python
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) libxml2-devel 2.9.7-16.el8_8.1, libxml2-debuginfo 2.9.7-16.el8_8.1, libxml2-debugsource 2.9.7-16.el8_8.1, python3-libxml2-debuginfo 2.9.7-16.el8_8.1
    fixed: vendor fix RHSA-2023:4529
  • Red Hat Enterprise Linux AppStream (v. 9) libxml2-devel 2.9.13-3.el9_2.1, libxml2-debuginfo 2.9.13-3.el9_2.1, libxml2-debugsource 2.9.13-3.el9_2.1, python3-libxml2-debuginfo 2.9.13-3.el9_2.1
    fixed: vendor fix RHSA-2023:4349
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) libxml2-devel 2.9.7-13.el8_6.4, libxml2-debuginfo 2.9.7-13.el8_6.4, libxml2-debugsource 2.9.7-13.el8_6.4, python3-libxml2-debuginfo 2.9.7-13.el8_6.4
    fixed: vendor fix RHSA-2024:0413
  • Red Hat Enterprise Linux BaseOS (v. 8) libxml2 2.9.7-16.el8_8.1, python3-libxml2 2.9.7-16.el8_8.1
    fixed: vendor fix RHSA-2023:4529
  • Red Hat Enterprise Linux BaseOS (v. 9) libxml2 2.9.13-3.el9_2.1, python3-libxml2 2.9.13-3.el9_2.1
    fixed: vendor fix RHSA-2023:4349
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) libxml2 2.9.7-13.el8_6.4, python3-libxml2 2.9.7-13.el8_6.4
    fixed: vendor fix RHSA-2024:0413
  • Red Hat JBoss Core Services 2.4.57
    fixed: vendor fix RHSA-2023:4628
show 1 more
  • Red Hat CloudForms Management Engine 5 rubygem-nokogiri Red Hat 3scale API Management Platform 2 nokogiri Red Hat Satellite 6 tfm-rubygem-nokogiri
    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 6.5

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-25-044-09 updated cvss 6.5

Siemens SCALANCE W700 IEEE 802.11ax

  • Siemens SCALANCE WAB762-1 (6GK5762-1AJ00-6AA0) <V3.0.0 Siemens SCALANCE WAM763-1 (6GK5763-1AL00-7DA0) <V3.0.0 Siemens SCALANCE WAM763-1 (ME) (6GK5763-1AL00-7DC0) <V3.0.0 Siemens SCALANCE WAM763-1 (US) (6GK5763-1AL00-7DB0) <V3.0.0 Siemens SCALANCE WAM766-1 (6GK5766-1GE00-7DA0) <V3.0.0 Siemens SCALANCE WAM766-1 (ME) (6GK5766-1GE00-7DC0) <V3.0.0
    +13 more products
    Siemens SCALANCE WAM766-1 (US) (6GK5766-1GE00-7DB0) <V3.0.0 Siemens SCALANCE WAM766-1 EEC (6GK5766-1GE00-7TA0) <V3.0.0 Siemens SCALANCE WAM766-1 EEC (ME) (6GK5766-1GE00-7TC0) <V3.0.0 Siemens SCALANCE WAM766-1 EEC (US) (6GK5766-1GE00-7TB0) <V3.0.0 Siemens SCALANCE WUB762-1 (6GK5762-1AJ00-1AA0) <V3.0.0 Siemens SCALANCE WUB762-1 iFeatures (6GK5762-1AJ00-2AA0) <V3.0.0 Siemens SCALANCE WUM763-1 (6GK5763-1AL00-3AA0) <V3.0.0 Siemens SCALANCE WUM763-1 (6GK5763-1AL00-3DA0) <V3.0.0 Siemens SCALANCE WUM763-1 (US) (6GK5763-1AL00-3AB0) <V3.0.0 Siemens SCALANCE WUM763-1 (US) (6GK5763-1AL00-3DB0) <V3.0.0 Siemens SCALANCE WUM766-1 (6GK5766-1GE00-3DA0) <V3.0.0 Siemens SCALANCE WUM766-1 (ME) (6GK5766-1GE00-3DC0) <V3.0.0 Siemens SCALANCE WUM766-1 (USA) (6GK5766-1GE00-3DB0) <V3.0.0
    affected: fixed in V3.0.0 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-24-165-04 updated cvss 6.5

Siemens ST7 ScadaConnect

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

cisa ICSA-24-165-10 updated cvss 6.5

Siemens SIMATIC and SIPLUS

  • Siemens SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) <V2.3 Siemens SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) <V2.3 Siemens SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) <V2.3 Siemens SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) <V2.3 Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) <V2.3 Siemens SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) <V2.3
    affected: fixed in V2.3 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 SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.24% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/libxml2/-/issues/491 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia XML2_jll
<2.10.4+0
>=2.11.5+0, <2.12.0+0
2.10.4+0
2.12.0+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

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.