CVE-2025-4444

EUVD-2025-29912

18.09.2025, 14:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	3.7 LOW	NETWORK	HIGH	NONE	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Debian Releases

Debian Product

Codename

tor

bookworm	vulnerable
bookworm (security)	0.4.9.6-0+deb12u1 fixed
bullseye	vulnerable
bullseye (security)	vulnerable
forky	0.4.9.6-1 fixed
sid	0.4.9.6-1 fixed
trixie	vulnerable
trixie (security)	0.4.9.6-0+deb13u1 fixed

Common Weakness Enumeration

CWE-400 - Uncontrolled Resource Consumption
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

References

https://forum.torproject.org/t/alpha-and-stable-release-0-4-8-18-and-0-4-9-3-alpha/20578

https://github.com/chunmianwang/Tordos

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