HighFix available
tor — security advisory
Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network Security Services (NSS), aka TROVE-2020-001.
- Products
- tor
- Affected versions
- Not specified
- Fixed versions
- 0.4.3.6-1
- CVEs
- CVE-2020-15572
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:42 UTC · Revision 1
Source evidence
Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network Security Services (NSS), aka TROVE-2020-001.
osv:DEBIAN-CVE-2020-15572
tor
Fixed versions: 0.4.3.6-1
tor
Fixed versions: 0.4.3.6-1
tor
Fixed versions: 0.4.3.6-1
Complete source record
{
"id": "983da99e82ee65ed8d4cc341a58a1074981a4bd0e4f6e5d7705a567be8347033",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-15572",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2020-15572",
"summary": "Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network Security Services (NSS), aka TROVE-2020-001.",
"evidence": "osv:DEBIAN-CVE-2020-15572",
"products": [
{
"name": {
"value": "tor",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.4.3.6-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tor",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.4.3.6-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tor",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.4.3.6-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2020-15572",
"aliases": [
"DEBIAN-CVE-2020-15572"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.3.6-1"
}
]
}
],
"package": {
"name": "tor",
"purl": "pkg:deb/debian/tor?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-15572.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.3.6-1"
}
]
}
],
"package": {
"name": "tor",
"purl": "pkg:deb/debian/tor?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-15572.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.3.6-1"
}
]
}
],
"package": {
"name": "tor",
"purl": "pkg:deb/debian/tor?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-15572.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
],
"modified": "2026-10-26T12:00:42.622949981Z",
"provider": "osv",
"upstream": [
"CVE-2020-15572"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2020-15572"
]
},
"related_cves": [
{
"value": "CVE-2020-15572",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 451282,
"published_at": "2020-07-15T17:15:11.283+00:00"
}