CVE-2021-36222 (GCVE-0-2021-36222)
Vulnerability from cvelistv5 – Published: 2021-07-22 17:28 – Updated: 2024-08-04 00:54
VLAI
EPSS
VEX
Summary
ec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation.
Severity
7.5 (High)
CWE
- n/a
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://web.mit.edu/kerberos/advisories/ | x_refsource_MISC |
| https://github.com/krb5/krb5/releases | x_refsource_MISC |
| https://www.debian.org/security/2021/dsa-4944 | vendor-advisoryx_refsource_DEBIAN |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://github.com/krb5/krb5/commit/fc98f520caeff… | x_refsource_CONFIRM |
| https://security.netapp.com/advisory/ntap-2021102… | x_refsource_CONFIRM |
| https://security.netapp.com/advisory/ntap-2021110… | x_refsource_CONFIRM |
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"url": "https://web.mit.edu/kerberos/advisories/"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2021/dsa-4944"
},
{
"source": "cve@mitre.org",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/krb5/krb5/commit/fc98f520caefff2e5ee9a0026fdf5109944b3562"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Release Notes",
"Third Party Advisory"
],
"url": "https://github.com/krb5/krb5/releases"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20211022-0003/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20211104-0007/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Not Applicable"
],
"url": "https://web.mit.edu/kerberos/advisories/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2021/dsa-4944"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T21:40:06+00:00",
"cve": "CVE-2021-36222",
"id": "CVE-2021-36222",
"initial_release_date": "2021-07-12T00:00:00+00:00",
"product_status:fixed": "80",
"product_status:known_affected": "8",
"product_status:known_not_affected": "11",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-36222.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-05T17:11:50Z",
"cve": "CVE-2021-36222",
"id": "CVE-2021-36222",
"initial_release_date": "2023-02-15T03:39:46Z",
"product_status:known_affected": "305",
"product_status:known_not_affected": "271",
"product_status:recommended": "1654",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-36222",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-36222.json",
"version": "68"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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.
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