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CVE-2025-4444

Tor Onion Service Descriptor resource consumption

CVSS 6.3 MEDIUMEPSS 0.4%CWE-400CWE-404
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 6.3EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado
Lifecycle
18 Sep 2025Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
Affected products
n/a · Tor

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References
https://forum.torproject.org/t/alpha-and-stable-release-0-4-8-18-and-0-4-9-3-alpha/20578https://github.com/chunmianwang/Tordoshttps://gitlab.torproject.org/tpo/core/tor/-/raw/release-0.4.8/ReleaseNoteshttps://vuldb.com/?ctiid.324814https://vuldb.com/?id.324814https://vuldb.com/?submit.640605