USN-5221-1 (UBUNTU-CVE-2021-21309)
Vulnerability from osv_ubuntu – Published: 2022-08-03 10:10 – Updated: 2026-06-29 10:52 – Source website
VLAI
Summary
redis vulnerabilities
Details
It was discovered that Redis incorrectly handled certain specially crafted Lua scripts. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2021-32626)
It was discovered that Redis incorrectly handled some malformed requests when using Redis Lua Debugger. A remote attacker could possibly use this issue to cause a denial of service or other unspecified impact. This issue only affected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-32672)
It was discovered that Redis incorrectly handled certain Redis Standard Protocol (RESP) requests. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2021-32675)
It was discovered that Redis incorrectly handled some configuration parameters with specially crafted network payloads. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. Vulnerabilities CVE-2021-32627 and CVE-2021-41099 only affected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-32627, CVE-2021-32628, CVE-2021-32687, CVE-2021-41099).
It was discovered that Redis incorrectly handled memory when processing certain input in 32-bit systems. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. One vulnerability (CVE-2021-32761) only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM and Ubuntu 18.04 ESM and another vulnerability (CVE-2021-21309) only affected Ubuntu 18.04 ESM. (CVE-2021-32761, CVE-2021-21309).
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-32626",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32628",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32675",
"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"
}
]
},
{
"id": "CVE-2021-32687",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32761",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:14.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "redis-server",
"binary_version": "2:2.8.4-2ubuntu0.2+esm2"
},
{
"binary_name": "redis-tools",
"binary_version": "2:2.8.4-2ubuntu0.2+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "redis",
"purl": "pkg:deb/ubuntu/redis@2:2.8.4-2ubuntu0.2+esm2?arch=source\u0026distro=trusty/esm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:2.8.4-2ubuntu0.2+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:2.6.13-1",
"2:2.6.16-3",
"2:2.8.0-1",
"2:2.8.2-1",
"2:2.8.4-2",
"2:2.8.4-2ubuntu0.2",
"2:2.8.4-2ubuntu0.2+esm1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-32626",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32628",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32675",
"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"
}
]
},
{
"id": "CVE-2021-32687",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32761",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "redis-sentinel",
"binary_version": "2:3.0.6-1ubuntu0.4+esm1"
},
{
"binary_name": "redis-server",
"binary_version": "2:3.0.6-1ubuntu0.4+esm1"
},
{
"binary_name": "redis-tools",
"binary_version": "2:3.0.6-1ubuntu0.4+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "redis",
"purl": "pkg:deb/ubuntu/redis@2:3.0.6-1ubuntu0.4+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:3.0.6-1ubuntu0.4+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:3.0.3-3",
"2:3.0.5-1",
"2:3.0.5-2",
"2:3.0.5-3",
"2:3.0.5-4",
"2:3.0.6-1",
"2:3.0.6-1ubuntu0.2",
"2:3.0.6-1ubuntu0.3",
"2:3.0.6-1ubuntu0.4"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-21309",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32626",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32627",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32628",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32672",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32675",
"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"
}
]
},
{
"id": "CVE-2021-32687",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32761",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-41099",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "redis",
"binary_version": "5:4.0.9-1ubuntu0.2+esm3"
},
{
"binary_name": "redis-sentinel",
"binary_version": "5:4.0.9-1ubuntu0.2+esm3"
},
{
"binary_name": "redis-server",
"binary_version": "5:4.0.9-1ubuntu0.2+esm3"
},
{
"binary_name": "redis-tools",
"binary_version": "5:4.0.9-1ubuntu0.2+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "redis",
"purl": "pkg:deb/ubuntu/redis@5:4.0.9-1ubuntu0.2+esm3?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5:4.0.9-1ubuntu0.2+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4:4.0.1-7",
"4:4.0.2-6",
"4:4.0.2-9",
"5:4.0.5-1",
"5:4.0.6-1",
"5:4.0.6-2",
"5:4.0.7-1",
"5:4.0.8-1",
"5:4.0.8-2",
"5:4.0.9-1",
"5:4.0.9-1ubuntu0.1",
"5:4.0.9-1ubuntu0.2",
"5:4.0.9-1ubuntu0.2+esm2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2021-32626",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32627",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32628",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32672",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-32675",
"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"
}
]
},
{
"id": "CVE-2021-32687",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-41099",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "redis",
"binary_version": "5:5.0.7-2ubuntu0.1+esm1"
},
{
"binary_name": "redis-sentinel",
"binary_version": "5:5.0.7-2ubuntu0.1+esm1"
},
{
"binary_name": "redis-server",
"binary_version": "5:5.0.7-2ubuntu0.1+esm1"
},
{
"binary_name": "redis-tools",
"binary_version": "5:5.0.7-2ubuntu0.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "redis",
"purl": "pkg:deb/ubuntu/redis@5:5.0.7-2ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5:5.0.7-2ubuntu0.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5:5.0.5-2build1",
"5:5.0.6-1",
"5:5.0.7-1",
"5:5.0.7-2",
"5:5.0.7-2ubuntu0.1~esm1",
"5:5.0.7-2ubuntu0.1"
]
}
],
"aliases": [],
"details": "It was discovered that Redis incorrectly handled certain specially crafted\nLua scripts. A remote attacker could possibly use this issue to cause a\ndenial of service or execute arbitrary code. (CVE-2021-32626)\n\nIt was discovered that Redis incorrectly handled some malformed requests\nwhen using Redis Lua Debugger. A remote attacker could possibly use this\nissue to cause a denial of service or other unspecified impact. This issue\nonly affected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-32672)\n\nIt was discovered that Redis incorrectly handled certain Redis Standard\nProtocol (RESP) requests. A remote attacker could possibly use this issue\nto cause a denial of service. (CVE-2021-32675)\n\nIt was discovered that Redis incorrectly handled some configuration\nparameters with specially crafted network payloads. A remote attacker\ncould possibly use this issue to cause a denial of service or execute\narbitrary code. Vulnerabilities CVE-2021-32627 and CVE-2021-41099\nonly affected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM.\n(CVE-2021-32627, CVE-2021-32628, CVE-2021-32687, CVE-2021-41099).\n\nIt was discovered that Redis incorrectly handled memory when processing\ncertain input in 32-bit systems. A remote attacker could possibly use\nthis issue to cause a denial of service or execute arbitrary code.\nOne vulnerability (CVE-2021-32761) only affected Ubuntu 14.04 ESM,\nUbuntu 16.04 ESM and Ubuntu 18.04 ESM and another vulnerability\n(CVE-2021-21309) only affected Ubuntu 18.04 ESM.\n(CVE-2021-32761, CVE-2021-21309).\n",
"id": "USN-5221-1",
"modified": "2026-06-29T10:52:53Z",
"published": "2022-08-03T10:10:42Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-5221-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-21309"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-32626"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-32627"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-32628"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-32672"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-32675"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-32687"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-32761"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-41099"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "redis vulnerabilities",
"upstream": [
"UBUNTU-CVE-2021-21309",
"UBUNTU-CVE-2021-32626",
"UBUNTU-CVE-2021-32627",
"UBUNTU-CVE-2021-32628",
"UBUNTU-CVE-2021-32672",
"UBUNTU-CVE-2021-32675",
"UBUNTU-CVE-2021-32687",
"UBUNTU-CVE-2021-32761",
"UBUNTU-CVE-2021-41099"
]
}
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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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