| Name | CVE-2025-4444 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1115744 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| tor (PTS) | bullseye (security), bullseye | 0.4.5.16-1 | vulnerable |
| bookworm, bookworm (security) | 0.4.7.16-1 | vulnerable |
| forky, sid, trixie | 0.4.8.16-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| tor | source | bullseye | (unfixed) | end-of-life | | |
| tor | source | (unstable) | (unfixed) | | | 1115744 |
Notes
[trixie] - tor <no-dsa> (Minor issue)
[bookworm] - tor <no-dsa> (Minor issue)
[bullseye] - tor <end-of-life> (see DSA 5562)
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