MediumCVE-2023-0466

    Certificate policy check not enabled (CVE-2023-0466)

    Published Last modified Sources: Siemens ProductCERT, BSI, Red Hat, Debian, Ubuntu, CVE.org, Msrc Update Guide

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    What is affected, what to do

    The function X509_VERIFY_PARAM_add0_policy() is documented to implicitly enable the certificate policy check when doing certificate verification. However the implementation of the function does not enable the check which allows certificates with invalid or incorrect policies to pass the certificate verification.

    Update OpenSSL to version 3.1.1, OpenSSL to version 3.0.9, OpenSSL to version 1.1.1u.

    Affected
    • OpenSSL lt 3.1.0..3.1.1
    • OpenSSL lt 3.0.0..3.0.9
    • OpenSSL lt 1.1.1..1.1.1u
    • OpenSSL lt 1.0.2..1.0.2zh
    Fixed in
    • OpenSSL 3.1.1
    • OpenSSL 3.0.9
    • OpenSSL 1.1.1u
    • OpenSSL 1.0.2zh

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    5.3

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    5.3

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Siemens ProductCERT, BSI, Red Hat, Debian, Ubuntu, CVE.org, Msrc Update Guide

    1.8 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 78.3

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    77.83 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    5.3 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    5.3
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    1.8 %
    Moderate — model estimates 1-10% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    78.3
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 19 February 2025

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    The function X509_VERIFY_PARAM_add0_policy() is documented to implicitly enable the certificate policy check when doing certificate verification. However the implementation of the function does not enable the check which allows certificates with invalid or incorrect policies to pass the certificate verification. As suddenly enabling the policy check could break existing deployments it was decided to keep the existing behavior of the X509_VERIFY_PARAM_add0_policy() function. Instead the applications that require OpenSSL to perform certificate policy check need to use X509_VERIFY_PARAM_set1_policies() or explicitly enable the policy check by calling X509_VERIFY_PARAM_set_flags() with the X509_V_FLAG_POLICY_CHECK flag argument. Certificate policy checks are disabled by default in OpenSSL and are not commonly used by applications.

    Source: siemens_advisory, BSI CSAF, BSI WID Portal, redhat_csaf, Debian Security Advisories, Ubuntu Security Notices, NVD (NIST), Microsoft Security Update Guide, cvelistv5

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    OpenSSLOpenSSL
    • 1.1.1 – < 1.1.1u
    • 3.1.0 – < 3.1.1
    • 1.0.2 – < 1.0.2zh
    • 3.0.0 – < 3.0.9
    • 1.1.1u
    • 3.1.1
    • 1.0.2zh
    • 3.0.9
    opensslopenssl
    • 1.0.2 – < 1.0.2zh
    • 1.1.1 – < 1.1.1u
    • 3.0.0 – < 3.0.9
    • 3.1.0 – < 3.1.1
    • 1.0.2zh
    • 1.1.1u
    • 3.0.9
    • 3.1.1
    DellECS
    • < 3.8.1.0
    • 3.8.1.0
    XeroxFreeFlow Print Server
    • v9 for Solaris
    • v9
    • v7
    • v2 / Windows 10
    • 9
    • —
    • —
    • —
    • —
    • —

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianopensslbullseye
    Linuxubuntuopensslbionic
    Linuxubuntuopensslfocal
    Linuxubuntuopenssljammy
    Linuxubuntuopensslkinetic
    Linuxubuntuopenssllunar
    Linuxubuntuopenssltrusty
    Linuxubuntuopensslxenial
    Linuxubuntuopenssl1.0bionic

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedopenssl.org

      Show 25 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      http://www.openwall.com/lists/oss-security/2023/09/28/4
      Referenceadded
      —
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=0d16b7e99aafc0b4a6d729eec65a411a7e025f0a
      Referenceadded
      —
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=51e8a84ce742db0f6c70510d0159dad8f7825908
      Referenceadded
      —
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=73398dea26de9899fb4baa94098ad0a61f435c72
      Referenceadded
      —
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fc814a30fc4f0bc54fcea7d9a7462f5457aab061
      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2023/06/msg00011.html
      Referenceadded
      —
      https://security.gentoo.org/glsa/202402-08
      Referenceadded
      —
      https://security.netapp.com/advisory/ntap-20230414-0001/
      Referenceadded
      —
      https://www.debian.org/security/2023/dsa-5417
      Referenceadded
      —
      https://www.openssl.org/news/secadv/20230328.txt
      Referenceremoved
      http://www.openwall.com/lists/oss-security/2023/09/28/4
      —
      Referenceremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=0d16b7e99aafc0b4a6d729eec65a411a7e025f0a
      —
      Referenceremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=51e8a84ce742db0f6c70510d0159dad8f7825908
      —
      Referenceremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=73398dea26de9899fb4baa94098ad0a61f435c72
      —
      Referenceremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fc814a30fc4f0bc54fcea7d9a7462f5457aab061
      —
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2023/06/msg00011.html
      —
      Referenceremoved
      https://security.gentoo.org/glsa/202402-08
      —
      Referenceremoved
      https://security.netapp.com/advisory/ntap-20230414-0001/
      —
      Referenceremoved
      https://www.debian.org/security/2023/dsa-5417
      —
      Referenceremoved
      https://www.openssl.org/news/secadv/20230328.txt
      —
      Reference typeremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=0d16b7e99aafc0b4a6d729eec65a411a7e025f0a Types: Mailing List, Patch
      —
      Reference typeremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=51e8a84ce742db0f6c70510d0159dad8f7825908 Types: Mailing List, Patch
      —
      Reference typeremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=73398dea26de9899fb4baa94098ad0a61f435c72 Types: Broken Link
      —
      Reference typeremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fc814a30fc4f0bc54fcea7d9a7462f5457aab061 Types: Mailing List, Patch
      —
      Reference typeremoved
      https://www.openssl.org/news/secadv/20230328.txt Types: Vendor Advisory
      —

      Source identifier: openssl-security@openssl.org

    2. Record modifiedCVE Program

      Show 25 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      http://www.openwall.com/lists/oss-security/2023/09/28/4
      Referenceadded
      —
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=0d16b7e99aafc0b4a6d729eec65a411a7e025f0a
      Referenceadded
      —
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=51e8a84ce742db0f6c70510d0159dad8f7825908
      Referenceadded
      —
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=73398dea26de9899fb4baa94098ad0a61f435c72
      Referenceadded
      —
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fc814a30fc4f0bc54fcea7d9a7462f5457aab061
      Referenceadded
      —
      https://lists.debian.org/debian-lts-announce/2023/06/msg00011.html
      Referenceadded
      —
      https://security.gentoo.org/glsa/202402-08
      Referenceadded
      —
      https://security.netapp.com/advisory/ntap-20230414-0001/
      Referenceadded
      —
      https://www.debian.org/security/2023/dsa-5417
      Referenceadded
      —
      https://www.openssl.org/news/secadv/20230328.txt
      Referenceremoved
      http://www.openwall.com/lists/oss-security/2023/09/28/4
      —
      Referenceremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=0d16b7e99aafc0b4a6d729eec65a411a7e025f0a
      —
      Referenceremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=51e8a84ce742db0f6c70510d0159dad8f7825908
      —
      Referenceremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=73398dea26de9899fb4baa94098ad0a61f435c72
      —
      Referenceremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fc814a30fc4f0bc54fcea7d9a7462f5457aab061
      —
      Referenceremoved
      https://lists.debian.org/debian-lts-announce/2023/06/msg00011.html
      —
      Referenceremoved
      https://security.gentoo.org/glsa/202402-08
      —
      Referenceremoved
      https://security.netapp.com/advisory/ntap-20230414-0001/
      —
      Referenceremoved
      https://www.debian.org/security/2023/dsa-5417
      —
      Referenceremoved
      https://www.openssl.org/news/secadv/20230328.txt
      —
      Reference typeremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=0d16b7e99aafc0b4a6d729eec65a411a7e025f0a Types: Mailing List, Patch
      —
      Reference typeremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=51e8a84ce742db0f6c70510d0159dad8f7825908 Types: Mailing List, Patch
      —
      Reference typeremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=73398dea26de9899fb4baa94098ad0a61f435c72 Types: Broken Link
      —
      Reference typeremoved
      https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=fc814a30fc4f0bc54fcea7d9a7462f5457aab061 Types: Mailing List, Patch
      —
      Reference typeremoved
      https://www.openssl.org/news/secadv/20230328.txt Types: Vendor Advisory
      —

      Source identifier: af854a3a-2127-422b-91ae-364da2661108

    3. Record modifiedSiemens ADP

      Show 9 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2023/0xxx/CVE-2023-0466.json">CVE-2023-0466</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-337522.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-341067.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-398330.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-556635.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-625862.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-769027.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-794697.html
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-879734.html

      Source identifier: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

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