High
fossil — security advisory
Fossil before 2.14.2 and 2.15.x before 2.15.2 often skips the hostname check during TLS certificate validation.
- Products
- fossil
- Affected versions
- 1:1.33-3, 1:1.33-3ubuntu0.1~esm1, 1:2.10-1, 1:2.10-1ubuntu0.1, 1:2.15.2-1, 1:2.16-3, 1:2.16-3build1, 1:2.17-1, 1:2.17-2, 1:2.18-1, 1:2.18-1ubuntu0.1, 1:2.2-1, 1:2.22-1, 1:2.22-2, 1:2.23-1, 1:2.23-1build1, 1:2.23-1build2, 1:2.23-1ubuntu0.1, 1:2.24-6, 1:2.26-1, 1:2.26-2, 1:2.28-1, 1:2.28-1build1, 1:2.4-1, 1:2.4-1build1, 1:2.5-1, 1:2.5-1ubuntu0.1~esm1, 1:2.8-1
- Fixed versions
- Not specified
- CVEs
- CVE-2021-36377
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:59 UTC · Revision 1
Source evidence
Fossil before 2.14.2 and 2.15.x before 2.15.2 often skips the hostname check during TLS certificate validation.
osv:UBUNTU-CVE-2021-36377
fossil
Fixed versions: Not specified
fossil
Fixed versions: Not specified
fossil
Fixed versions: Not specified
fossil
Fixed versions: Not specified
fossil
Fixed versions: Not specified
fossil
Fixed versions: Not specified
fossil
Fixed versions: Not specified
fossil
Fixed versions: Not specified
Complete source record
{
"id": "c276fb3d722800a90001c5bf8d9e69ca97561b9840ce22f5519e879a200eaa51",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-36377",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-36377",
"summary": "Fossil before 2.14.2 and 2.15.x before 2.15.2 often skips the hostname check during TLS certificate validation.",
"evidence": "osv:UBUNTU-CVE-2021-36377",
"products": [
{
"name": {
"value": "fossil",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.33-3",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.33-3ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "fossil",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:2.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.4-1build1",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:2.5-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "fossil",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:2.8-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:2.10-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:2.10-1ubuntu0.1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "fossil",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:2.15.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:2.16-3",
"evidence": "/affected/3/versions"
},
{
"value": "1:2.16-3build1",
"evidence": "/affected/3/versions"
},
{
"value": "1:2.17-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:2.17-2",
"evidence": "/affected/3/versions"
},
{
"value": "1:2.18-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:2.18-1ubuntu0.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "fossil",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:2.22-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:2.22-2",
"evidence": "/affected/4/versions"
},
{
"value": "1:2.23-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:2.23-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "1:2.23-1build2",
"evidence": "/affected/4/versions"
},
{
"value": "1:2.23-1ubuntu0.1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "fossil",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:2.24-6",
"evidence": "/affected/5/versions"
},
{
"value": "1:2.26-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:2.26-2",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "fossil",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:2.26-2",
"evidence": "/affected/6/versions"
},
{
"value": "1:2.28-1",
"evidence": "/affected/6/versions"
},
{
"value": "1:2.28-1build1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "fossil",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:2.26-2",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2021-36377",
"aliases": [
"UBUNTU-CVE-2021-36377"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fossil",
"purl": "pkg:deb/ubuntu/fossil?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1:1.33-3",
"1:1.33-3ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fossil",
"binary_version": "1:1.33-3ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fossil",
"purl": "pkg:deb/ubuntu/fossil?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1:2.2-1",
"1:2.4-1",
"1:2.4-1build1",
"1:2.5-1",
"1:2.5-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fossil",
"binary_version": "1:2.5-1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fossil",
"purl": "pkg:deb/ubuntu/fossil?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1:2.8-1",
"1:2.10-1",
"1:2.10-1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fossil",
"binary_version": "1:2.10-1ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fossil",
"purl": "pkg:deb/ubuntu/fossil?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1:2.15.2-1",
"1:2.16-3",
"1:2.16-3build1",
"1:2.17-1",
"1:2.17-2",
"1:2.18-1",
"1:2.18-1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fossil",
"binary_version": "1:2.18-1ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fossil",
"purl": "pkg:deb/ubuntu/fossil?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1:2.22-1",
"1:2.22-2",
"1:2.23-1",
"1:2.23-1build1",
"1:2.23-1build2",
"1:2.23-1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fossil",
"binary_version": "1:2.23-1ubuntu0.1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fossil",
"purl": "pkg:deb/ubuntu/fossil?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"1:2.24-6",
"1:2.26-1",
"1:2.26-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fossil",
"binary_version": "1:2.26-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fossil",
"purl": "pkg:deb/ubuntu/fossil?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1:2.26-2",
"1:2.28-1",
"1:2.28-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fossil",
"binary_version": "1:2.28-1build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "fossil",
"purl": "pkg:deb/ubuntu/fossil?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1:2.26-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36377.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "fossil",
"binary_version": "1:2.26-2"
}
]
}
}
],
"modified": "2026-10-17T12:56:20.438516316Z",
"provider": "osv",
"upstream": [
"CVE-2021-36377"
],
"references": [
"https://ubuntu.com/security/CVE-2021-36377",
"https://fossil-scm.org/forum/forumpost/8d367e16f53d93c789d70bd3bf2c9587227bbd5c6a7b8e512cccd79007536036",
"https://www.cve.org/CVERecord?id=CVE-2021-36377"
]
},
"related_cves": [
{
"value": "CVE-2021-36377",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355328,
"published_at": "2021-07-12T13:15:00+00:00"
}