FKIE_CVE-2018-20217
Vulnerability from fkie_nvd - Published: 2018-12-26 21:29 - Updated: 2026-06-17 01:52
Severity
Summary
A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| mit | kerberos | * | |
| debian | debian_linux | 8.0 | |
| debian | debian_linux | 9.0 |
{
"affected": [
{
"affectedData": [
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"product": "n/a",
"vendor": "n/a",
"versions": [
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"status": "affected",
"version": "n/a"
}
]
}
],
"source": "cve@mitre.org"
}
],
"configurations": [
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"versionEndExcluding": "5-1.17",
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request."
},
{
"lang": "es",
"value": "Se ha descubierto un problema de aserci\u00f3n alcanzable en el KDC en MIT Kerberos 5 (tambi\u00e9n conocido como krb5), en versiones anteriores a la 1.17. Si un atacante puede obtener un ticket krbtgt mediante un tipo de cifrado m\u00e1s antiguo (DES, Triple DES o RC4), este puede provocar el cierre inesperado de KDC realizando una petici\u00f3n S4U2Self."
}
],
"id": "CVE-2018-20217",
"lastModified": "2026-06-17T01:52:28.013",
"metrics": {
"cvssMetricV2": [
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"acInsufInfo": false,
"baseSeverity": "LOW",
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"accessVector": "NETWORK",
"authentication": "SINGLE",
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"baseScore": 3.5,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:S/C:N/I:N/A:P",
"version": "2.0"
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"impactScore": 2.9,
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"cvssMetricV31": [
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"attackVector": "NETWORK",
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"baseScore": 5.3,
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"scope": "UNCHANGED",
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"published": "2018-12-26T21:29:02.543",
"references": [
{
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"tags": [
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"url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763"
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},
{
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"url": "https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html"
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{
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},
{
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"url": "https://security.netapp.com/advisory/ntap-20190416-0006/"
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"tags": [
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"url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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"url": "https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086"
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
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],
"url": "https://security.netapp.com/advisory/ntap-20190416-0006/"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-617"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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
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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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