# CVE-2025-4444: tor: A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17

CVE-2025-4444 is fixed in tor on 1 platform, first by DEBIAN-CVE-2025-4444, released September 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-4444
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0048
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 18, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tor Debian 12.15 (bookworm) | 0.4.9.6-0+deb12u1 | [DEBIAN-CVE-2025-4444](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4444.md) | Sep 18, 2025 |
| Linux | tor Debian 13.5 (trixie) | 0.4.9.6-0+deb13u1 | [DEBIAN-CVE-2025-4444](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4444.md) | Sep 18, 2025 |
| Linux | tor Debian 14 | 0.4.8.21-1 | [DEBIAN-CVE-2025-4444](https://patchblox.com/security/data/fix/linux/debian-cve-2025-4444.md) | Sep 18, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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