What is CVE-2022-33903?

CVE-2022-33903 is a high-severity vulnerability in Torproject Tor. CVSS score: 7.5/10. Published 2022-07-17.

How severe is CVE-2022-33903?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Torproject Tor

CVE-2022-33903

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

Published 2022-07-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (68.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.013 · change: +0.000

Affected products

Torproject Tor

References

lists.torproject.org/pipermail/tor-announce/2022-June/000242.html (Patch, Mailing List, Vendor Advisory)
security-tracker.debian.org/tracker/CVE-2022-33903 (Third Party Advisory)
security.gentoo.org/glsa/202305-11 (vendor-advisory)

Frequently asked questions

What is CVE-2022-33903?: CVE-2022-33903 is a high-severity vulnerability in Torproject Tor. CVSS score: 7.5/10. Published 2022-07-17.
How severe is CVE-2022-33903?: High severity. CVSS v3 base score is 7.5 out of 10.