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Fencer Vulns
high 7.5

CVE-2023-0464 json

Excessive Resource Usage Verifying X.509 Policy Constraints

published 2023-03-22 3 y ago modified 2026-10-14 25 d ago also EUVD-2023-12518 , GHSA-w2w6-xp88-5cvw , JLSEC-2026-235

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.0%
EPSS 4.0% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

A security vulnerability has been identified in all supported versions

of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems.

Policy processing is disabled by default but can be enabled by passing the `-policy' argument to the command line utilities or by calling the `X509_VERIFY_PARAM_set1_policies()' function.

Patch / fix

  • julia OpenSSL_jll 1.1.21+0, 3.0.9+0
  • julia Openresty_jll 1.27.1+0
  • OpenSSL OpenSSL 1.0.2zh, 1.1.1u, 3.0.9, 3.1.1
  • Siemens BFCClient V2.17
  • 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 SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • openssl Debian 14, Debian 13, Debian 12 3.0.9-1

debian advisories DEBIAN-CVE-2023-0464

  • edk2 Ubuntu 22.04 LTS 2022.02-3ubuntu0.22.04.4
  • openssl Ubuntu 18.04 LTS 1.1.1-1ubuntu2.1~18.04.22
  • openssl Ubuntu 20.04 LTS 1.1.1f-1ubuntu2.18
  • openssl Ubuntu 22.04 LTS 3.0.2-0ubuntu1.9
  • openssl1.0 Ubuntu 18.04 LTS 1.0.2n-1ubuntu5.12
  • openssl Ubuntu Pro 14.04 LTS 1.0.1f-1ubuntu2.27+esm7
  • openssl Ubuntu Pro 16.04 LTS 1.0.2g-1ubuntu4.20+esm7
  • openssl Ubuntu Pro FIPS-updates 16.04 LTS 1.0.2g-1ubuntu4.fips.4.20.7

ubuntu advisories UBUNTU-CVE-2023-0464

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

  • openssl RHEL 9 1:3.0.7-16.el9_2
  • openssl-libs RHEL 9 1:3.0.7-16.el9_2
  • openssl-perl RHEL 9 1:3.0.7-16.el9_2
  • jbcs-httpd24-curl jboss core services 1 8.4.0-2.el7jbcs
  • jbcs-httpd24-curl jboss core services 1 8.4.0-2.el8jbcs
  • jbcs-httpd24-mod_jk jboss core services 1 1.2.49-1.redhat_1.el7jbcs
  • jbcs-httpd24-mod_jk jboss core services 1 1.2.49-1.redhat_1.el8jbcs
  • jbcs-httpd24-libcurl jboss core services 1 8.4.0-2.el7jbcs

red hat advisories RHSA-2023:3722RHSA-2023:7625RHSA-2023:7622

  • openssl-1_1 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +11 more 1.1.1d-150200.11.62.1
  • openssl-1_1 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 1.1.1d-2.78.1
  • openssl-3 SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 3.0.1-150400.4.20.1
  • openssl-1_1 SLE Module for Basesystem 15 SP4, SLE Micro 5.4, SLE Micro 5.3 +2 more 1.1.1l-150400.7.31.2
  • openssl SLES 12 SP2-BCL 1.0.2j-60.89.1
  • compat-openssl098 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLE Module for Legacy 12 0.9.8j-106.45.1
  • openssl-1_0_0 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 1.0.2p-3.69.1
  • openssl-1_0_0 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +9 more 1.0.2p-150000.3.70.1

suse advisories SUSE-SU-2023:1790-1SUSE-SU-2023:1764-1SUSE-SU-2023:1754-1SUSE-SU-2023:1748-1SUSE-SU-2023:1747-1SUSE-SU-2023:1746-1

  • python-pymssql openSUSE Tumbleweed 2.3.12-1.1
  • openssl-1_0_0 openSUSE Tumbleweed 1.0.2u-14.1
  • openssl-1_1 openSUSE Tumbleweed 1.1.1t-2.1
  • openssl-3 openSUSE Tumbleweed 3.1.1-1.1

opensuse advisories openSUSE-SU-2026:10199-1openSUSE-SU-2024:12824-1openSUSE-SU-2024:12825-1openSUSE-SU-2024:12969-1

  • openssl AlmaLinux 9 1:3.0.7-16.el9_2
  • openssl-libs AlmaLinux 9 1:3.0.7-16.el9_2
  • openssl-perl AlmaLinux 9 1:3.0.7-16.el9_2

almalinux advisories ALSA-2023:3722

  • openssl Alpine 3.16, Alpine 3.14 1.1.1t-r1
  • openssl Alpine 3.15 1.1.1t-r2
  • openssl Alpine 3.17 3.0.8-r1
  • openssl Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 3.1.0-r1
  • openssl3 Alpine 3.16, Alpine 3.15 3.0.8-r1
  • openssl1.1-compat Alpine 3.18, Alpine 3.17 1.1.1t-r1

alpine advisories ALPINE-CVE-2023-0464

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

  • rust CBL-Mariner 2.0 1.68.0-1
  • kata-containers-cc CBL-Mariner 2.0 0.4.1-2
  • edk2 CBL-Mariner 2.0 20230301gitf80f052277c8-34
  • edk2 Azure Linux 3.0 20230301gitf80f052277c8-37
  • hvloader CBL-Mariner 2.0 1.0.1-3

azure linux advisories AZL-25709AZL-26731AZL-31141AZL-34664AZL-37680

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-2023-0464 updated cvss 5.9

openssl: Denial of service by excessive resource usage in verifying X509 policy constraints

  • Red Hat Enterprise Linux 6 openssl, openssl-perl Red Hat Enterprise Linux 7 ovmf, OVMF, AAVMF, openssl, openssl-libs, openssl-perl
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 shim, openssl, shim-x64, shim-aa64, shim-ia32, openssl-libs, +2 more Red Hat Enterprise Linux 9 shim, shim-x64, shim-aa64, compat-openssl11
    affected: no fix available, no fix planned “Will not fix”
  • Red Hat JBoss Web Server 3 openssl
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 9) openssl-perl 3.0.7-16.el9_2 Red Hat Enterprise Linux BaseOS (v. 9) openssl 3.0.7-16.el9_2, openssl-libs 3.0.7-16.el9_2
    fixed: vendor fix RHSA-2023:3722
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2023:7626
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-openssl 1.1.1k-16.el7jbcs, jbcs-httpd24-openssl-libs 1.1.1k-16.el7jbcs, jbcs-httpd24-openssl-perl 1.1.1k-16.el7jbcs Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-openssl 1.1.1k-16.el8jbcs, jbcs-httpd24-openssl-libs 1.1.1k-16.el8jbcs, jbcs-httpd24-openssl-perl 1.1.1k-16.el8jbcs
    fixed: vendor fix RHSA-2023:7625
  • Red Hat JBoss Web Server 5
    fixed: vendor fix RHSA-2023:7623
  • Red Hat JBoss Web Server 5.7 for RHEL 7 Server jws5-tomcat-native 1.2.31-16.redhat_16.el7jws Red Hat JBoss Web Server 5.7 for RHEL 8 jws5-tomcat-native 1.2.31-16.redhat_16.el8jws Red Hat JBoss Web Server 5.7 for RHEL 9 jws5-tomcat-native 1.2.31-16.redhat_16.el9jws
    fixed: vendor fix RHSA-2023:7622
show 1 more
  • Red Hat Enterprise Linux 8 edk2, edk2-ovmf, edk2-aarch64 Red Hat Enterprise Linux 9 edk2, edk2-ovmf, edk2-tools, edk2-aarch64 Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-curl 8.4.0-2.el7jbcs, jbcs-httpd24-httpd 2.4.57-7.el7jbcs, jbcs-httpd24-libcurl 8.4.0-2.el7jbcs, jbcs-httpd24-mod_md 2.4.24-2.el7jbcs, jbcs-httpd24-mod_ssl 2.4.57-7.el7jbcs, jbcs-httpd24-mod_ldap 2.4.57-7.el7jbcs, +20 more Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-curl 8.4.0-2.el8jbcs, jbcs-httpd24-httpd 2.4.57-7.el8jbcs, jbcs-httpd24-libcurl 8.4.0-2.el8jbcs, jbcs-httpd24-mod_md 2.4.24-2.el8jbcs, jbcs-httpd24-mod_ssl 2.4.57-7.el8jbcs, jbcs-httpd24-mod_ldap 2.4.57-7.el8jbcs, +20 more Red Hat JBoss Web Server 5.7 for RHEL 7 Server jws5-tomcat 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-lib 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-javadoc 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-selinux 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-webapps 9.0.62-19.redhat_00017.1.el7jws, jws5-tomcat-java-jdk8 9.0.62-19.redhat_00017.1.el7jws, +6 more Red Hat JBoss Web Server 5.7 for RHEL 8 jws5-tomcat 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-lib 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-javadoc 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-selinux 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-webapps 9.0.62-19.redhat_00017.1.el8jws, jws5-tomcat-el-3.0-api 9.0.62-19.redhat_00017.1.el8jws, +4 more
    +1 more products
    Red Hat JBoss Web Server 5.7 for RHEL 9 jws5-tomcat 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-lib 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-javadoc 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-selinux 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-webapps 9.0.62-19.redhat_00017.1.el9jws, jws5-tomcat-el-3.0-api 9.0.62-19.redhat_00017.1.el9jws, +4 more
    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 7.5

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-25-226-21 updated cvss 7.5

Siemens BFCClient

  • Siemens BFCClient < 2.17
    affected: fixed in V2.17

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 7.5

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-24-165-06 updated cvss 7.5

Siemens TIM 1531 IRC

  • Siemens SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) <V2.4.8 Siemens TIM 1531 IRC (6GK7543-1MX00-0XE0) <V2.4.8
    affected: fixed in V2.4.8 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 7.5

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 7.5

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 ICSA-24-165-11 updated cvss 7.5

Siemens SCALANCE XM-400, XR-500

  • Siemens SCALANCE XM408-4C (6GK5408-4GP00-2AM2) <V6.6.1 Siemens SCALANCE XM408-4C (L3 int.) (6GK5408-4GQ00-2AM2) <V6.6.1 Siemens SCALANCE XM408-8C (6GK5408-8GS00-2AM2) <V6.6.1 Siemens SCALANCE XM408-8C (L3 int.) (6GK5408-8GR00-2AM2) <V6.6.1 Siemens SCALANCE XM416-4C (6GK5416-4GS00-2AM2) <V6.6.1 Siemens SCALANCE XM416-4C (L3 int.) (6GK5416-4GR00-2AM2) <V6.6.1
    +20 more products
    Siemens SCALANCE XR524-8C, 1x230V (6GK5524-8GS00-3AR2) <V6.6.1 Siemens SCALANCE XR524-8C, 1x230V (L3 int.) (6GK5524-8GR00-3AR2) <V6.6.1 Siemens SCALANCE XR524-8C, 2x230V (6GK5524-8GS00-4AR2) <V6.6.1 Siemens SCALANCE XR524-8C, 2x230V (L3 int.) (6GK5524-8GR00-4AR2) <V6.6.1 Siemens SCALANCE XR524-8C, 24V (6GK5524-8GS00-2AR2) <V6.6.1 Siemens SCALANCE XR524-8C, 24V (L3 int.) (6GK5524-8GR00-2AR2) <V6.6.1 Siemens SCALANCE XR526-8C, 1x230V (6GK5526-8GS00-3AR2) <V6.6.1 Siemens SCALANCE XR526-8C, 1x230V (L3 int.) (6GK5526-8GR00-3AR2) <V6.6.1 Siemens SCALANCE XR526-8C, 2x230V (6GK5526-8GS00-4AR2) <V6.6.1 Siemens SCALANCE XR526-8C, 2x230V (L3 int.) (6GK5526-8GR00-4AR2) <V6.6.1 Siemens SCALANCE XR526-8C, 24V (6GK5526-8GS00-2AR2) <V6.6.1 Siemens SCALANCE XR526-8C, 24V (L3 int.) (6GK5526-8GR00-2AR2) <V6.6.1 Siemens SCALANCE XR528-6M (2HR2, L3 int.) (6GK5528-0AR00-2HR2) <V6.6.1 Siemens SCALANCE XR528-6M (2HR2) (6GK5528-0AA00-2HR2) <V6.6.1 Siemens SCALANCE XR528-6M (6GK5528-0AA00-2AR2) <V6.6.1 Siemens SCALANCE XR528-6M (L3 int.) (6GK5528-0AR00-2AR2) <V6.6.1 Siemens SCALANCE XR552-12M (2HR2, L3 int.) (6GK5552-0AR00-2AR2) <V6.6.1 Siemens SCALANCE XR552-12M (2HR2) (6GK5552-0AA00-2HR2) <V6.6.1 Siemens SCALANCE XR552-12M (2HR2) (6GK5552-0AR00-2HR2) <V6.6.1 Siemens SCALANCE XR552-12M (6GK5552-0AA00-2AR2) <V6.6.1
    affected: fixed in V6.6.1 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-23-166-11 updated cvss 7.5

Siemens SIMATIC S7-1500 TM MFP Linux Kernel

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
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

3.98% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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

Affected packages

ecosystem package affected fixed in
julia OpenSSL_jll
<1.1.21+0
>=3.0.8+0, <3.0.9+0
1.1.21+0
3.0.9+0
julia Openresty_jll
<1.27.1+0
1.27.1+0

Affected products

  • OpenSSL OpenSSL
  • Siemens BFCClient
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-295 Improper Certificate Validation
Technology feeds

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.