USN-7542-1 (UBUNTU-CVE-2025-3576)
Vulnerability from osv_ubuntu – Published: 2025-05-28 14:41 – Updated: 2026-06-25 10:46 – Source websiteIt was discovered that Kerberos allowed the usage of weak cryptographic standards. An attacker could possibly use this issue to expose sensitive information.
This update introduces the allow_rc4 and allow_des3 configuration options, and disables the usage of RC4 and 3DES ciphers by default. Users are advised to discontinue their usage and upgrade to stronger encryption protocols. If the use of the insecure RC4 and 3DES algorithms is necessary, they can be enabled with the aforementioned configuration options.
| URL | Type | |
|---|---|---|
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},
{
"binary_name": "libgssrpc4t64",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libk5crypto3",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkadm5clnt-mit12",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkadm5srv-mit12",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkdb5-10t64",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkrad0",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkrb5-3",
"binary_version": "1.20.1-6ubuntu2.6"
},
{
"binary_name": "libkrb5support0",
"binary_version": "1.20.1-6ubuntu2.6"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "krb5",
"purl": "pkg:deb/ubuntu/krb5@1.20.1-6ubuntu2.6?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.20.1-6ubuntu2.6"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.20.1-3ubuntu1",
"1.20.1-5build1",
"1.20.1-6ubuntu1",
"1.20.1-6ubuntu2",
"1.20.1-6ubuntu2.1",
"1.20.1-6ubuntu2.2",
"1.20.1-6ubuntu2.3",
"1.20.1-6ubuntu2.4",
"1.20.1-6ubuntu2.5"
]
}
],
"aliases": [],
"details": "It was discovered that Kerberos allowed the usage of weak cryptographic\nstandards. An attacker could possibly use this issue to expose sensitive\ninformation.\n\nThis update introduces the allow_rc4 and allow_des3 configuration options,\nand disables the usage of RC4 and 3DES ciphers by default. Users are\nadvised to discontinue their usage and upgrade to stronger encryption\nprotocols. If the use of the insecure RC4 and 3DES algorithms is necessary,\nthey can be enabled with the aforementioned configuration options.",
"id": "USN-7542-1",
"modified": "2026-06-25T10:46:50Z",
"published": "2025-05-28T14:41:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7542-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2025-3576"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "krb5 vulnerability",
"upstream": [
"UBUNTU-CVE-2025-3576"
]
}
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.
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.