Medium
offlineimap3 — security advisory
OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS/man-in-the-middle attacks, taking over the connection and extracting account credentials in cleartext.
- Products
- offlineimap3
- Affected versions
- 0.0~git20210225.1e7ef9e+dfsg-4, 0.0~git20211018.e64c254+dfsg-1, 0.0~git20230519.c9f44ad+dfsg-1, 0.0~git20231201.77e70ed+dfsg-1, 0.0~git20231218.d29a4dc+dfsg-3ubuntu1, 0.0~git20240826.db34745+dfsg-2ubuntu1, 0.0~git20240826.db34745+dfsg-2ubuntu2, 8.0.3+dfsg-2
- Fixed versions
- Not specified
- CVEs
- CVE-2020-37248
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:52 UTC · Revision 1
Source evidence
OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS/man-in-the-middle attacks, taking over the connection and extracting account credentials in cleartext.
osv:UBUNTU-CVE-2020-37248
offlineimap3
Fixed versions: Not specified
offlineimap3
Fixed versions: Not specified
offlineimap3
Fixed versions: Not specified
offlineimap3
Fixed versions: Not specified
offlineimap3
Fixed versions: Not specified
Complete source record
{
"id": "a25fb819450971fe2df87a893bc06cf4151ab8e22ee5c2ae89e6ee9330174125",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-37248",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2020-37248",
"summary": "OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS/man-in-the-middle attacks, taking over the connection and extracting account credentials in cleartext.",
"evidence": "osv:UBUNTU-CVE-2020-37248",
"products": [
{
"name": {
"value": "offlineimap3",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20210225.1e7ef9e+dfsg-4",
"evidence": "/affected/0/versions"
},
{
"value": "0.0~git20211018.e64c254+dfsg-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "offlineimap3",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20230519.c9f44ad+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.0~git20231201.77e70ed+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.0~git20231218.d29a4dc+dfsg-3ubuntu1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "offlineimap3",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20240826.db34745+dfsg-2ubuntu1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "offlineimap3",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20240826.db34745+dfsg-2ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "8.0.3+dfsg-2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "offlineimap3",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.0~git20240826.db34745+dfsg-2ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "0.0~git20240826.db34745+dfsg-2ubuntu2",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2020-37248",
"aliases": [
"UBUNTU-CVE-2020-37248"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "offlineimap3",
"purl": "pkg:deb/ubuntu/offlineimap3?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.0~git20210225.1e7ef9e+dfsg-4",
"0.0~git20211018.e64c254+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-37248.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "offlineimap",
"binary_version": "7.3.3+dfsg1-1+0.0~git20211018.e64c254+dfsg-1"
},
{
"binary_name": "offlineimap3",
"binary_version": "0.0~git20211018.e64c254+dfsg-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "offlineimap3",
"purl": "pkg:deb/ubuntu/offlineimap3?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.0~git20230519.c9f44ad+dfsg-1",
"0.0~git20231201.77e70ed+dfsg-1",
"0.0~git20231218.d29a4dc+dfsg-3ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-37248.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "offlineimap",
"binary_version": "7.3.3+dfsg1-1+0.0~git20231218.d29a4dc+dfsg-3ubuntu1"
},
{
"binary_name": "offlineimap3",
"binary_version": "0.0~git20231218.d29a4dc+dfsg-3ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "offlineimap3",
"purl": "pkg:deb/ubuntu/offlineimap3?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"0.0~git20240826.db34745+dfsg-2ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-37248.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "offlineimap",
"binary_version": "7.3.3+dfsg1-1+0.0~git20240826.db34745+dfsg-2ubuntu1"
},
{
"binary_name": "offlineimap3",
"binary_version": "0.0~git20240826.db34745+dfsg-2ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "offlineimap3",
"purl": "pkg:deb/ubuntu/offlineimap3?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"0.0~git20240826.db34745+dfsg-2ubuntu2",
"8.0.3+dfsg-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-37248.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "offlineimap",
"binary_version": "8.0.3+dfsg-2"
},
{
"binary_name": "offlineimap3",
"binary_version": "8.0.3+dfsg-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "offlineimap3",
"purl": "pkg:deb/ubuntu/offlineimap3?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.0~git20240826.db34745+dfsg-2ubuntu1",
"0.0~git20240826.db34745+dfsg-2ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-37248.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "offlineimap",
"binary_version": "7.3.3+dfsg1-1+0.0~git20240826.db34745+dfsg-2ubuntu2"
},
{
"binary_name": "offlineimap3",
"binary_version": "0.0~git20240826.db34745+dfsg-2ubuntu2"
}
]
}
}
],
"modified": "2026-10-17T12:56:14.122078134Z",
"provider": "osv",
"upstream": [
"CVE-2020-37248"
],
"references": [
"https://ubuntu.com/security/CVE-2020-37248",
"https://www.cve.org/CVERecord?id=CVE-2020-37248",
"https://github.com/OfflineIMAP/offlineimap3/issues/222",
"https://github.com/OfflineIMAP/offlineimap/issues/669",
"https://github.com/OfflineIMAP/offlineimap3/commit/46505c53ef995455d66c685f9ec3ff6ea93dbb74",
"https://pypi.org/project/offlineimap/#history"
]
},
"related_cves": [
{
"value": "CVE-2020-37248",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354993,
"published_at": "2026-06-08T16:16:00+00:00"
}