HighCVE-2022-42898

    MIT Kerberos 5: Heap-Based Buffer Overflow (CVE-2022-42898)

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

    What is affected, what to do

    PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c.

    Update MIT Kerberos 5 to version 1.19.4, Heimdal Project Heimdal to version 7.7.1, Samba to version 4.15.12.

    Affected
    • MIT Kerberos 5 lt 1.8..1.19.4
    • MIT Kerberos 5 eq 1.20..1.20
    • Heimdal Project Heimdal lt *..7.7.1
    • Samba lt *..4.15.12
    • Samba lt 4.16.0..4.16.7
    • Samba lt 4.17.0..4.17.3
    Fixed in
    • MIT Kerberos 5 1.19.4
    • Heimdal Project Heimdal 7.7.1
    • Samba 4.15.12
    • Samba 4.16.7
    • Samba 4.17.3

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

    Metrics

    8.8

    Priority

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

    Source: NVD, CVSS v3

    8.8

    CVSS v3

    Severity High on the scale from 0 to 10.

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

    6.9 %

    EPSS score

    Moderate — model estimates 1-10% exploitation likelihood.

    Source: FIRST EPSS, percentile 94.0

    Show all metrics
    Severity
    High
    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
    116.63 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
    8.8 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
    8.8
    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
    6.9 %
    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
    94.0
    Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
    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: total
    Source: CISA Vulnrichment, as of 14 April 2025
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-190

    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
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    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

    PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c. Heimdal before 7.7.1 has "a similar bug."

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

    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
    heimdal_projectheimdal
    • < 7.7.1
    • 7.7.1
    mitkerberos_5
    • 1.20
    • 1.8 – < 1.19.4
    • —
    • 1.19.4
    sambasamba
    • 4.16.0 – < 4.16.7
    • < 4.15.12
    • 4.17.0 – < 4.17.3
    • 4.16.7
    • 4.15.12
    • 4.17.3
    DellECS
    • < 3.8.1.0
    • 3.8.1.0

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxdebianheimdalbullseye
    Linuxdebiankrb5bullseye

    Weakness classes (CWE)

    • CWE-190Integer Overflow or Wraparound

      Base

      The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

      Entry at MITRE CWE-190

    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 modifiedMITRE

      Show 29 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://bugzilla.samba.org/show_bug.cgi?id=15203
      Referenceadded
      —
      https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c
      Referenceadded
      —
      https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583
      Referenceadded
      —
      https://security.gentoo.org/glsa/202309-06
      Referenceadded
      —
      https://security.gentoo.org/glsa/202310-06
      Referenceadded
      —
      https://security.netapp.com/advisory/ntap-20230216-0008/
      Referenceadded
      —
      https://security.netapp.com/advisory/ntap-20230223-0001/
      Referenceadded
      —
      https://web.mit.edu/kerberos/advisories/
      Referenceadded
      —
      https://web.mit.edu/kerberos/krb5-1.19/
      Referenceadded
      —
      https://web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt
      Referenceadded
      —
      https://www.samba.org/samba/security/CVE-2022-42898.html
      Referenceremoved
      https://bugzilla.samba.org/show_bug.cgi?id=15203
      —
      Referenceremoved
      https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c
      —
      Referenceremoved
      https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583
      —
      Referenceremoved
      https://security.gentoo.org/glsa/202309-06
      —
      Referenceremoved
      https://security.gentoo.org/glsa/202310-06
      —
      Referenceremoved
      https://security.netapp.com/advisory/ntap-20230216-0008/
      —
      Referenceremoved
      https://security.netapp.com/advisory/ntap-20230223-0001/
      —
      Referenceremoved
      https://web.mit.edu/kerberos/advisories/
      —
      Referenceremoved
      https://web.mit.edu/kerberos/krb5-1.19/
      —
      Referenceremoved
      https://web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt
      —
      Referenceremoved
      https://www.samba.org/samba/security/CVE-2022-42898.html
      —
      Reference typeremoved
      https://bugzilla.samba.org/show_bug.cgi?id=15203 Types: Exploit, Issue Tracking, Patch, Third Party Advisory
      —
      Reference typeremoved
      https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c Types: Third Party Advisory
      —
      Reference typeremoved
      https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583 Types: Patch, Third Party Advisory
      —
      Reference typeremoved
      https://web.mit.edu/kerberos/advisories/ Types: Vendor Advisory
      —
      Reference typeremoved
      https://web.mit.edu/kerberos/krb5-1.19/ Types: Release Notes, Vendor Advisory
      —
      Reference typeremoved
      https://web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt Types: Vendor Advisory
      —
      Reference typeremoved
      https://www.samba.org/samba/security/CVE-2022-42898.html Types: Third Party Advisory
      —

      Source identifier: cve@mitre.org

    2. Record modifiedCVE Program

      Show 29 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://bugzilla.samba.org/show_bug.cgi?id=15203
      Referenceadded
      —
      https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c
      Referenceadded
      —
      https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583
      Referenceadded
      —
      https://security.gentoo.org/glsa/202309-06
      Referenceadded
      —
      https://security.gentoo.org/glsa/202310-06
      Referenceadded
      —
      https://security.netapp.com/advisory/ntap-20230216-0008/
      Referenceadded
      —
      https://security.netapp.com/advisory/ntap-20230223-0001/
      Referenceadded
      —
      https://web.mit.edu/kerberos/advisories/
      Referenceadded
      —
      https://web.mit.edu/kerberos/krb5-1.19/
      Referenceadded
      —
      https://web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt
      Referenceadded
      —
      https://www.samba.org/samba/security/CVE-2022-42898.html
      Referenceremoved
      https://bugzilla.samba.org/show_bug.cgi?id=15203
      —
      Referenceremoved
      https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c
      —
      Referenceremoved
      https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583
      —
      Referenceremoved
      https://security.gentoo.org/glsa/202309-06
      —
      Referenceremoved
      https://security.gentoo.org/glsa/202310-06
      —
      Referenceremoved
      https://security.netapp.com/advisory/ntap-20230216-0008/
      —
      Referenceremoved
      https://security.netapp.com/advisory/ntap-20230223-0001/
      —
      Referenceremoved
      https://web.mit.edu/kerberos/advisories/
      —
      Referenceremoved
      https://web.mit.edu/kerberos/krb5-1.19/
      —
      Referenceremoved
      https://web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt
      —
      Referenceremoved
      https://www.samba.org/samba/security/CVE-2022-42898.html
      —
      Reference typeremoved
      https://bugzilla.samba.org/show_bug.cgi?id=15203 Types: Exploit, Issue Tracking, Patch, Third Party Advisory
      —
      Reference typeremoved
      https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c Types: Third Party Advisory
      —
      Reference typeremoved
      https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583 Types: Patch, Third Party Advisory
      —
      Reference typeremoved
      https://web.mit.edu/kerberos/advisories/ Types: Vendor Advisory
      —
      Reference typeremoved
      https://web.mit.edu/kerberos/krb5-1.19/ Types: Release Notes, Vendor Advisory
      —
      Reference typeremoved
      https://web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt Types: Vendor Advisory
      —
      Reference typeremoved
      https://www.samba.org/samba/security/CVE-2022-42898.html Types: Third Party Advisory
      —

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

    3. Record modifiedSiemens ADP

      Show 2 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/2022/42xxx/CVE-2022-42898.json">CVE-2022-42898</a>
      Referenceadded
      —
      https://cert-portal.siemens.com/productcert/html/ssa-398330.html

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

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