UnratedFix available
fetchmail — security advisory
fetchmail 5.9.9 through 6.3.19 does not properly limit the wait time after issuing a (1) STARTTLS or (2) STLS request, which allows remote servers to cause a denial of service (application hang) by acknowledging the request but not sending additional packets.
- Products
- fetchmail
- Affected versions
- Not specified
- Fixed versions
- 6.3.22-1
- CVEs
- CVE-2011-1947
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:33 UTC · Revision 1
Source evidence
fetchmail 5.9.9 through 6.3.19 does not properly limit the wait time after issuing a (1) STARTTLS or (2) STLS request, which allows remote servers to cause a denial of service (application hang) by acknowledging the request but not sending additional packets.
osv:DEBIAN-CVE-2011-1947
fetchmail
Fixed versions: 6.3.22-1
fetchmail
Fixed versions: 6.3.22-1
fetchmail
Fixed versions: 6.3.22-1
Complete source record
{
"id": "809aaeed738f487345e7ee1ae1323958e238130334b9b4bacb864612cdd08824",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2011-1947",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2011-1947",
"summary": "fetchmail 5.9.9 through 6.3.19 does not properly limit the wait time after issuing a (1) STARTTLS or (2) STLS request, which allows remote servers to cause a denial of service (application hang) by acknowledging the request but not sending additional packets.",
"evidence": "osv:DEBIAN-CVE-2011-1947",
"products": [
{
"name": {
"value": "fetchmail",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.3.22-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "fetchmail",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.3.22-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "fetchmail",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.3.22-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "DEBIAN-CVE-2011-1947",
"aliases": [
"DEBIAN-CVE-2011-1947"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.3.22-1"
}
]
}
],
"package": {
"name": "fetchmail",
"purl": "pkg:deb/debian/fetchmail?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2011-1947.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.3.22-1"
}
]
}
],
"package": {
"name": "fetchmail",
"purl": "pkg:deb/debian/fetchmail?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2011-1947.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.3.22-1"
}
]
}
],
"package": {
"name": "fetchmail",
"purl": "pkg:deb/debian/fetchmail?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2011-1947.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
],
"modified": "2026-10-23T17:47:24.334069850Z",
"provider": "osv",
"upstream": [
"CVE-2011-1947"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2011-1947"
]
},
"related_cves": [
{
"value": "CVE-2011-1947",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 416743,
"published_at": "2011-06-02T19:55:03.903+00:00"
}