usn-5104-1
Vulnerability from osv_ubuntu
Published
2021-10-05 14:05
Modified
2026-04-27 14:11
Summary
squid, squid3 vulnerability
Details
Lyu discovered that Squid incorrectly handled WCCP protocol data. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly obtain sensitive information.
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-28116",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.27-1ubuntu1.12"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.27-1ubuntu1.12"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.27-1ubuntu1.12"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.27-1ubuntu1.12"
},
{
"binary_name": "squid3",
"binary_version": "3.5.27-1ubuntu1.12"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.27-1ubuntu1.12"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.12?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.27-1ubuntu1.12"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.5.23-5ubuntu1",
"3.5.23-5ubuntu2",
"3.5.27-1ubuntu1",
"3.5.27-1ubuntu1.1",
"3.5.27-1ubuntu1.2",
"3.5.27-1ubuntu1.3",
"3.5.27-1ubuntu1.4",
"3.5.27-1ubuntu1.5",
"3.5.27-1ubuntu1.6",
"3.5.27-1ubuntu1.7",
"3.5.27-1ubuntu1.8",
"3.5.27-1ubuntu1.9",
"3.5.27-1ubuntu1.10",
"3.5.27-1ubuntu1.11"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-28116",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "squid",
"binary_version": "4.10-1ubuntu1.5"
},
{
"binary_name": "squid-cgi",
"binary_version": "4.10-1ubuntu1.5"
},
{
"binary_name": "squid-common",
"binary_version": "4.10-1ubuntu1.5"
},
{
"binary_name": "squid-purge",
"binary_version": "4.10-1ubuntu1.5"
},
{
"binary_name": "squidclient",
"binary_version": "4.10-1ubuntu1.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "squid",
"purl": "pkg:deb/ubuntu/squid@4.10-1ubuntu1.5?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.10-1ubuntu1.5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.8-1ubuntu2",
"4.8-1ubuntu3",
"4.9-2ubuntu1",
"4.9-2ubuntu2",
"4.9-2ubuntu3",
"4.9-2ubuntu4",
"4.10-1ubuntu1",
"4.10-1ubuntu1.1",
"4.10-1ubuntu1.2",
"4.10-1ubuntu1.3",
"4.10-1ubuntu1.4"
]
}
],
"aliases": [],
"details": "Lyu discovered that Squid incorrectly handled WCCP protocol data. A remote\nattacker could use this issue to cause Squid to crash, resulting in a\ndenial of service, or possibly obtain sensitive information.\n",
"id": "USN-5104-1",
"modified": "2026-04-27T14:11:27Z",
"published": "2021-10-05T14:05:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5104-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-28116"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "squid, squid3 vulnerability",
"upstream": [
"UBUNTU-CVE-2021-28116"
]
}
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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.
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