Medium
tor — security advisory
A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.
- Products
- tor
- Affected versions
- 0.2.3.25-1, 0.2.4.19-1, 0.2.4.20-1, 0.2.4.27-1build0.14.04.1, 0.2.4.27-1ubuntu0.1, 0.2.4.27-1ubuntu0.1+esm1, 0.2.4.27-1ubuntu0.1+esm2, 0.2.6.10-1ubuntu2, 0.2.7.6-1ubuntu1, 0.2.9.11-1ubuntu1~16.04.1, 0.2.9.14-1ubuntu1~16.04.1, 0.2.9.14-1ubuntu1~16.04.2, 0.2.9.14-1ubuntu1~16.04.3, 0.2.9.14-1ubuntu1~16.04.3+esm1, 0.3.0.10-1, 0.3.1.8-2, 0.3.1.9-1, 0.3.2.10-1, 0.3.2.10-1ubuntu0.1, 0.3.2.10-1ubuntu0.2~esm1, 0.3.2.10-1ubuntu0.2~esm2, 0.3.2.9-1, 0.3.2.9-1build1, 0.4.1.5-1, 0.4.1.5-1build1, 0.4.1.6-1, 0.4.2.5-1, 0.4.2.6-1, 0.4.2.7-1, 0.4.2.7-1ubuntu0.1~esm1, 0.4.5.9-1, 0.4.6.10-1, 0.4.6.8-1, 0.4.6.8-1build1, 0.4.6.9-1, 0.4.8.10-1, 0.4.8.10-1build1, 0.4.8.10-1build2, 0.4.8.14-1, 0.4.8.16-1, 0.4.8.21-1, 0.4.8.22-1, 0.4.8.4-2, 0.4.8.7-1, 0.4.8.9-1, 0.4.9.11-0ubuntu0.22.04.1, 0.4.9.11-0ubuntu0.24.04.1, 0.4.9.11-0ubuntu0.26.04.1, 0.4.9.11-1, 0.4.9.11-1build1, 0.4.9.6-1, 0.4.9.8-1
- Fixed versions
- Not specified
- CVEs
- CVE-2025-4444
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:32 UTC · Revision 1
Source evidence
A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.
osv:UBUNTU-CVE-2025-4444
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
Complete source record
{
"id": "3b74ca34ea15dcefffa11bc8fc4d811bd5387d7272b37bdc82f2977ed08bda73",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2025-4444",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2025-4444",
"summary": "A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.",
"evidence": "osv:UBUNTU-CVE-2025-4444",
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{
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{
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{
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"evidence": "/affected/3/versions"
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{
"value": "0.4.2.5-1",
"evidence": "/affected/3/versions"
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{
"value": "0.4.2.6-1",
"evidence": "/affected/3/versions"
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/5/versions"
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{
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{
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{
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"severity": "medium",
"structured": {
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"aliases": [
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],
"metrics": [
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"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
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},
{
"type": "Ubuntu",
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}
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],
"database_specific": {
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},
"ecosystem_specific": {
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},
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}
]
}
}
],
"modified": "2026-10-17T12:57:03.149965443Z",
"provider": "osv",
"upstream": [
"CVE-2025-4444"
],
"references": [
"https://ubuntu.com/security/CVE-2025-4444",
"https://www.cve.org/CVERecord?id=CVE-2025-4444",
"https://github.com/chunmianwang/Tordos",
"https://forum.torproject.org/t/alpha-and-stable-release-0-4-8-18-and-0-4-9-3-alpha/20578",
"https://gitlab.torproject.org/tpo/core/tor/-/raw/release-0.4.8/ReleaseNotes",
"https://vuldb.com/?ctiid.324814",
"https://vuldb.com/?id.324814",
"https://vuldb.com/?submit.640605"
]
},
"related_cves": [
{
"value": "CVE-2025-4444",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 356674,
"published_at": "2025-09-18T14:15:00+00:00"
}