HighFix available
jruby, ruby2.3 and 3 more products — security advisory
The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object.
- Products
- jruby, ruby2.3, ruby2.5, ruby2.7, ruby3.0
- Affected versions
- 1.5.6-5ubuntu1, 1.5.6-6, 1.5.6-7, 1.5.6-9+deb8u2build0.14.04.1~esm2, 1.7.21-2ubuntu4, 1.7.22-1ubuntu1, 2.3.0-1, 2.3.0-2, 2.3.0-4ubuntu2, 2.3.0-4ubuntu3, 2.3.0-5ubuntu1, 2.3.1-2~16.04, 2.3.1-2~16.04.10, 2.3.1-2~16.04.11, 2.3.1-2~16.04.12, 2.3.1-2~16.04.2, 2.3.1-2~16.04.4, 2.3.1-2~16.04.5, 2.3.1-2~16.04.6, 2.3.1-2~16.04.7, 2.3.1-2~16.04.9, 2.3.1-2~ubuntu16.04.13, 2.3.1-2~ubuntu16.04.14, 2.3.1-2~ubuntu16.04.15, 2.3.1-2~ubuntu16.04.16, 2.3.1-2~ubuntu16.04.16+esm1, 2.3.1-2~ubuntu16.04.16+esm2, 2.3.1-2~ubuntu16.04.16+esm3, 2.5.0-4ubuntu1, 2.5.0-4ubuntu4, 2.5.0-5ubuntu1, 2.5.0-6ubuntu1, 2.5.0~preview1-1ubuntu2, 2.5.1-1ubuntu1, 2.5.1-1ubuntu1.1, 2.5.1-1ubuntu1.10, 2.5.1-1ubuntu1.11, 2.5.1-1ubuntu1.12, 2.5.1-1ubuntu1.2, 2.5.1-1ubuntu1.4, 2.5.1-1ubuntu1.5, 2.5.1-1ubuntu1.6, 2.5.1-1ubuntu1.7, 2.5.1-1ubuntu1.8, 2.5.1-1ubuntu1.9, 2.7.0-1, 2.7.0-2, 2.7.0-3, 2.7.0-4, 2.7.0-4ubuntu1, 2.7.0-5ubuntu1, 2.7.0-5ubuntu1.1, 2.7.0-5ubuntu1.2, 2.7.0-5ubuntu1.3, 2.7.0-5ubuntu1.4, 2.7.0-5ubuntu1.5, 2.7.0-5ubuntu1.6, 2.7.0-5ubuntu1.7, 3.0.2-5ubuntu1, 3.0.2-7, 3.0.2-7ubuntu2, 3.0.2-7ubuntu2.1, 3.0.2-7ubuntu2.2, 9.1.13.0-1, 9.1.17.0-1~18.04, 9.1.17.0-3, 9.1.17.0-3build5, 9.1.17.0-3build6, 9.3.9.0+ds-1, 9.4.14.0+ds-1, 9.4.5.0+ds-1, 9.4.5.0+ds-1ubuntu1, 9.4.6.0+ds-1ubuntu3, 9.4.8.0+ds-2ubuntu1, 9.4.8.0+ds-3ubuntu1
- Fixed versions
- 2.3.1-2~ubuntu16.04.16+esm4, 2.5.1-1ubuntu1.13, 2.7.0-5ubuntu1.8, 3.0.2-7ubuntu2.3
- CVEs
- CVE-2021-33621
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:00 UTC · Revision 1
Source evidence
The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object.
osv:UBUNTU-CVE-2021-33621
jruby
Fixed versions: Not specified
ruby2.3
Fixed versions: 2.3.1-2~ubuntu16.04.16+esm4
jruby
Fixed versions: Not specified
ruby2.5
Fixed versions: 2.5.1-1ubuntu1.13
jruby
Fixed versions: Not specified
ruby2.7
Fixed versions: 2.7.0-5ubuntu1.8
jruby
Fixed versions: Not specified
ruby3.0
Fixed versions: 3.0.2-7ubuntu2.3
jruby
Fixed versions: Not specified
jruby
Fixed versions: Not specified
jruby
Fixed versions: Not specified
jruby
Fixed versions: Not specified
Complete source record
{
"id": "49ad453b6eddda30b1e6557e1f31f9fd5e749392b654bd6bdc2140b2dea2cda6",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-33621",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-33621",
"summary": "The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object.",
"evidence": "osv:UBUNTU-CVE-2021-33621",
"products": [
{
"name": {
"value": "jruby",
"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "1.5.6-5ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.6-6",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.6-7",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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},
{
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{
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{
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"evidence": "/affected/1/versions"
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{
"value": "2.3.0-4ubuntu3",
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{
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"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~16.04",
"evidence": "/affected/1/versions"
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{
"value": "2.3.1-2~16.04.2",
"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
"value": "2.3.1-2~16.04.9",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~16.04.10",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~16.04.11",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~16.04.12",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~ubuntu16.04.13",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~ubuntu16.04.14",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~ubuntu16.04.15",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~ubuntu16.04.16",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~ubuntu16.04.16+esm1",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~ubuntu16.04.16+esm2",
"evidence": "/affected/1/versions"
},
{
"value": "2.3.1-2~ubuntu16.04.16+esm3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.21-2ubuntu4",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.22-1ubuntu1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "ruby2.5",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.5.1-1ubuntu1.13",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "2.5.0~preview1-1ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.0-4ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.0-4ubuntu4",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.0-5ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.0-6ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.1",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.2",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.4",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.5",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.6",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.7",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.8",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.9",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.10",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.11",
"evidence": "/affected/3/versions"
},
{
"value": "2.5.1-1ubuntu1.12",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.1.13.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "9.1.17.0-1~18.04",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "ruby2.7",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.0-5ubuntu1.8",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "2.7.0-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-2",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-3",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-4",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-4ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-5ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-5ubuntu1.1",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-5ubuntu1.2",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-5ubuntu1.3",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-5ubuntu1.4",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-5ubuntu1.5",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-5ubuntu1.6",
"evidence": "/affected/5/versions"
},
{
"value": "2.7.0-5ubuntu1.7",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.1.17.0-3",
"evidence": "/affected/6/versions"
},
{
"value": "9.1.17.0-3build5",
"evidence": "/affected/6/versions"
},
{
"value": "9.1.17.0-3build6",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "ruby3.0",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.0.2-7ubuntu2.3",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": [
{
"value": "3.0.2-5ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.2-7",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.2-7ubuntu2",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.2-7ubuntu2.1",
"evidence": "/affected/7/versions"
},
{
"value": "3.0.2-7ubuntu2.2",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.3.9.0+ds-1",
"evidence": "/affected/8/versions"
},
{
"value": "9.4.5.0+ds-1",
"evidence": "/affected/8/versions"
},
{
"value": "9.4.5.0+ds-1ubuntu1",
"evidence": "/affected/8/versions"
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{
"value": "9.4.6.0+ds-1ubuntu3",
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]
},
{
"name": {
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},
"prerequisites": [],
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"affected_versions": [
{
"value": "9.4.8.0+ds-2ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "9.4.8.0+ds-3ubuntu1",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.4.8.0+ds-3ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "9.4.14.0+ds-1",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "jruby",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "9.4.8.0+ds-3ubuntu1",
"evidence": "/affected/11/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2021-33621",
"aliases": [
"UBUNTU-CVE-2021-33621"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jruby",
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"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"1.5.6-5ubuntu1",
"1.5.6-6",
"1.5.6-7",
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],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33621.json"
},
"ecosystem_specific": {
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{
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}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
},
{
"fixed": "2.3.1-2~ubuntu16.04.16+esm4"
}
]
}
],
"package": {
"name": "ruby2.3",
"purl": "pkg:deb/ubuntu/ruby2.3?arch=source&distro=esm-infra%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"2.3.0-1",
"2.3.0-2",
"2.3.0-4ubuntu2",
"2.3.0-4ubuntu3",
"2.3.0-5ubuntu1",
"2.3.1-2~16.04",
"2.3.1-2~16.04.2",
"2.3.1-2~16.04.4",
"2.3.1-2~16.04.5",
"2.3.1-2~16.04.6",
"2.3.1-2~16.04.7",
"2.3.1-2~16.04.9",
"2.3.1-2~16.04.10",
"2.3.1-2~16.04.11",
"2.3.1-2~16.04.12",
"2.3.1-2~ubuntu16.04.13",
"2.3.1-2~ubuntu16.04.14",
"2.3.1-2~ubuntu16.04.15",
"2.3.1-2~ubuntu16.04.16",
"2.3.1-2~ubuntu16.04.16+esm1",
"2.3.1-2~ubuntu16.04.16+esm2",
"2.3.1-2~ubuntu16.04.16+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33621.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libruby2.3",
"binary_version": "2.3.1-2~ubuntu16.04.16+esm4"
},
{
"binary_name": "ruby2.3",
"binary_version": "2.3.1-2~ubuntu16.04.16+esm4"
},
{
"binary_name": "ruby2.3-tcltk",
"binary_version": "2.3.1-2~ubuntu16.04.16+esm4"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jruby",
"purl": "pkg:deb/ubuntu/jruby?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"1.7.21-2ubuntu4",
"1.7.22-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33621.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "jruby",
"binary_version": "1.7.22-1ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.5.1-1ubuntu1.13"
}
]
}
],
"package": {
"name": "ruby2.5",
"purl": "pkg:deb/ubuntu/ruby2.5?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"2.5.0~preview1-1ubuntu2",
"2.5.0-4ubuntu1",
"2.5.0-4ubuntu4",
"2.5.0-5ubuntu1",
"2.5.0-6ubuntu1",
"2.5.1-1ubuntu1",
"2.5.1-1ubuntu1.1",
"2.5.1-1ubuntu1.2",
"2.5.1-1ubuntu1.4",
"2.5.1-1ubuntu1.5",
"2.5.1-1ubuntu1.6",
"2.5.1-1ubuntu1.7",
"2.5.1-1ubuntu1.8",
"2.5.1-1ubuntu1.9",
"2.5.1-1ubuntu1.10",
"2.5.1-1ubuntu1.11",
"2.5.1-1ubuntu1.12"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33621.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libruby2.5",
"binary_version": "2.5.1-1ubuntu1.13"
},
{
"binary_name": "ruby2.5",
"binary_version": "2.5.1-1ubuntu1.13"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jruby",
"purl": "pkg:deb/ubuntu/jruby?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"9.1.13.0-1",
"9.1.17.0-1~18.04"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-33621.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "jruby",
"binary_version": "9.1.17.0-1~18.04"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.0-5ubuntu1.8"
}
]
}
],
"package": {
"name": "ruby2.7",
"purl": "pkg:deb/ubuntu/ruby2.7?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"2.7.0-1",
"2.7.0-2",
"2.7.0-3",
"2.7.0-4",
"2.7.0-4ubuntu1",
"2.7.0-5ubuntu1",
"2.7.0-5ubuntu1.1",
"2.7.0-5ubuntu1.2",
"2.7.0-5ubuntu1.3",
"2.7.0-5ubuntu1.4",
"2.7.0-5ubuntu1.5",
"2.7.0-5ubuntu1.6",
"2.7.0-5ubuntu1.7"
],
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},
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],
"modified": "2026-10-17T12:56:20.620828796Z",
"provider": "osv",
"upstream": [
"CVE-2021-33621"
],
"references": [
"https://ubuntu.com/security/CVE-2021-33621",
"https://www.ruby-lang.org/en/news/2022/11/22/http-response-splitting-in-cgi-cve-2021-33621/",
"https://github.com/ruby/cgi/commit/64c5045c0a6b84fdb938a8465a0890e5f7162708",
"https://github.com/ruby/cgi/commit/b46d41c36380e04f6388970b5ef05c687f4d1819",
"https://ubuntu.com/security/notices/USN-5806-1",
"https://ubuntu.com/security/notices/USN-5806-2",
"https://ubuntu.com/security/notices/USN-5806-3",
"https://ubuntu.com/security/notices/USN-6181-1",
"https://www.cve.org/CVERecord?id=CVE-2021-33621"
]
},
"related_cves": [
{
"value": "CVE-2021-33621",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355341,
"published_at": "2022-11-18T23:15:00+00:00"
}