Vulnerability-Lookup

CVE-2020-28196 (GCVE-0-2020-28196)

Vulnerability from cvelistv5 – Published: 2020-11-06 07:07 – Updated: 2025-12-03 18:15

Summary

MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-03 18:14 UTC

CWE

n/a
CWE-674 - Uncontrolled Recursion

Assigner

mitre mitre root

References

14 references

URL	Tags
https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202011-17	vendor-advisoryx_refsource_GENTOO
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.debian.org/security/2020/dsa-4795	vendor-advisoryx_refsource_DEBIAN
https://www.oracle.com/security-alerts/cpuApr2021.html	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021051…	x_refsource_CONFIRM
https://github.com/krb5/krb5/commit/57415dda6cf04…	x_refsource_CONFIRM
https://security.netapp.com/advisory/ntap-2020120…	x_refsource_CONFIRM
https://lists.apache.org/thread.html/rf4c02775860…	mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r58af02e294b…	mailing-listx_refsource_MLIST
https://www.oracle.com//security-alerts/cpujul2021.html	x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC

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                          "product_name": "n/a",
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                  "url": "https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%3Cissues.bookkeeper.apache.org%3E"
                },
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                  "name": "[bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8",
                  "refsource": "MLIST",
                  "url": "https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b@%3Cissues.bookkeeper.apache.org%3E"
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      "cveMetadata": {
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        "assignerShortName": "mitre",
        "cveId": "CVE-2020-28196",
        "datePublished": "2020-11-06T07:07:38.000Z",
        "dateReserved": "2020-11-03T00:00:00.000Z",
        "dateUpdated": "2025-12-03T18:15:34.180Z",
        "state": "PUBLISHED"
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}

SSA-398330

Vulnerability from csaf_siemens - Published: 2023-12-12 00:00 - Updated: 2025-08-12 00:00

Summary

SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5

Scope

544 vulnerabilities in this advisory, including CVE-2020-28196.

CVE-2020-28196

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109478459/

Open the full advisory

SUSE-SU-2020:3375-1

Vulnerability from csaf_suse - Published: 2020-11-19 08:28 - Updated: 2020-11-19 08:28

Summary

Security update for krb5

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2020-28196.

CVE-2020-28196

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 74 products

Open the full advisory

SUSE-SU-2020:3377-1

Vulnerability from csaf_suse - Published: 2020-11-19 08:29 - Updated: 2020-11-19 08:29

Summary

Security update for krb5

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2020-28196.

CVE-2020-28196

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 58 products

Open the full advisory

SUSE-SU-2020:3379-1

Vulnerability from csaf_suse - Published: 2020-11-19 08:30 - Updated: 2020-11-19 08:30

Summary

Security update for krb5

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2020-28196.

CVE-2020-28196

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 279 products

Open the full advisory

UBUNTU-CVE-2020-28196 (CVE-2020-28196)

Vulnerability from osv_ubuntu – Published: 2020-11-06 08:15 – Updated: 2026-04-22 07:39 – Source website

Details

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2020-28196	REPORT
	https://lists.debian.org/debian-lts-announce/2020…	REPORT
	https://ubuntu.com/security/notices/USN-4635-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2020-28196	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "krb5-admin-server",
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          },
          {
            "binary_name": "krb5-gss-samples",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
          },
          {
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            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
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          },
          {
            "binary_name": "krb5-locales",
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          },
          {
            "binary_name": "krb5-multidev",
            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
          },
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          {
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          {
            "binary_name": "krb5-user",
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          },
          {
            "binary_name": "libgssapi-krb5-2",
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            "binary_version": "1.12+dfsg-2ubuntu5.4+esm2"
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          },
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            "binary_name": "libgssrpc4",
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          {
            "binary_name": "libkadm5clnt-mit9",
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            },
            {
              "fixed": "1.17-6ubuntu4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.17-6",
        "1.17-6ubuntu3",
        "1.17-6ubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.",
  "id": "UBUNTU-CVE-2020-28196",
  "modified": "2026-04-22T07:39:37Z",
  "published": "2020-11-06T08:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-28196"
    },
    {
      "type": "REPORT",
      "url": "https://lists.debian.org/debian-lts-announce/2020/11/msg00011.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4635-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-28196"
    }
  ],
  "related": [
    "USN-4635-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-28196"
  ]
}

WID-SEC-W-2022-0602

Vulnerability from csaf_certbund - Published: 2022-07-06 22:00 - Updated: 2024-01-17 23:00

Summary

IBM Security Verify Access: Mehrere Schwachstellen

Severity

Mittel

Scope

19 vulnerabilities in this advisory, including CVE-2020-28196.

CVE-2020-28196

In IBM Security Verify Access existieren mehrere Schwachstellen. Neben dem Programm sind auch die folgenden Komponenten betroffen: Manager Appliance, libxml2, OpenSSL, yaml-cpp, MIT Kerberos, MIT krb5 und FasterXML jackson-databind. Ein entfernter, anonymer, authentisierter oder lokaler Angreifer oder ein Angreifer aus dem angrenzenden Netzwerk kann diese Schwachstellen ausnutzen, um einen Cross-Site-Scripting-Angriff durchzuführen, vertrauliche Informationen offenzulegen, seine Privilegien zu erweitern, Informationen zu manipulieren, einen Denial-of-Service-Zustand zu verursachen und Sicherheitsmaßnahmen zu umgehen. Die erfolgreiche Ausnutzung einiger dieser Schwachstellen erfordert eine Benutzerinteraktion und erhöhte Rechte.

Known affected: 3 products

Open the full advisory

WID-SEC-W-2022-1481

Vulnerability from csaf_certbund - Published: 2020-11-05 23:00 - Updated: 2023-01-11 23:00

Summary

MIT Kerberos: Schwachstelle ermöglicht Denial of Service

Severity

Mittel

Scope

1 vulnerability in this advisory, including CVE-2020-28196.

CVE-2020-28196

Es existiert eine Schwachstelle in MIT Kerberos. Der libkrb5 ASN.1-Decoder unterstützt unbegrenzte BER-Längen. Die Tag-Länge wird mithilfe einer Rekursion berechnet. Das Fehlen eines Rekursionslimits ermöglicht es einem entfernten anonymen Angreifer einen Stapelüberlauf zu verursachen und den Prozess zum Absturz zu bringen.

Known affected: 8 products

Open the full advisory

WID-SEC-W-2023-0065

Vulnerability from csaf_certbund - Published: 2021-04-20 22:00 - Updated: 2023-09-27 22:00

Summary

Oracle MySQL: Mehrere Schwachstellen

Severity

Hoch

Scope

48 vulnerabilities in this advisory, including CVE-2020-28196.

CVE-2020-28196

In Oracle MySQL existieren mehrere Schwachstellen. Durch Ausnutzung dieser Schwachstellen kann ein entfernter Angreifer die Verfügbarkeit, Vertraulichkeit und Integrität gefährden. Für die Ausnutzung einiger dieser Schwachstellen ist keine Benutzerinteraktion und keine Authentisierung notwendig. Oracle veröffentlicht keine weiteren Details zu diesen Schwachstellen (außer der Information in der Risiko Matrix im Oracle Advisory zum Critical Patch Update, siehe Link unten in diesem Advisory). Aufgrund der knappen Informationslage erfolgt die Bewertung der Schadenshöhe ausschließlich auf Basis der CVSS Impact Matrix. Der Maximalwert für diese Produkte ist "High" für "Availability", "Confidentiality" und "Integrity" und bewirkt damit eine "hohe" Schadenshöhe.

Known affected: 8 products Last affected: 2 products

Open the full advisory

WID-SEC-W-2025-0227

Vulnerability from csaf_certbund - Published: 2021-11-30 23:00 - Updated: 2025-01-30 23:00

Summary

IBM QRadar SIEM: Mehrere Schwachstellen

Severity

Hoch

Scope

105 vulnerabilities in this advisory, including CVE-2020-28196.

CVE-2020-28196

In IBM QRadar SIEM existieren mehrere Schwachstellen. Die Schwachstellen bestehen in verschiedenen Komponenten. Ein entfernter, anonymer oder authentisierter oder lokaler Angreifer kann diese Schwachstellen ausnutzen, um seine Privilegien zu erweitern, Administratorrechte zu erlangen, beliebigen Programmcode auszuführen, Informationen offenzulegen, Dateien zu manipulieren oder Sicherheitsvorkehrungen zu umgehen.

Known affected: 3 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2020-28196 (GCVE-0-2020-28196)

UBUNTU-CVE-2020-28196 (CVE-2020-28196)

Tags

Sightings

Nomenclature

Related by attack behaviour