CVE-2006-6893

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2006-12-31 · updated 2026-06-16

Description

Tor allows remote attackers to discover the IP address of a hidden service by accessing this service at a high rate, thereby changing the server's CPU temperature and consequently changing the pattern of time values visible through (1) ICMP timestamps, (2) TCP sequence numbers, and (3) TCP timestamps, a different vulnerability than CVE-2006-0414. NOTE: it could be argued that this is a laws-of-physics vulnerability that is a fundamental design limitation of certain hardware implementations, so perhaps this issue should not be included in CVE.

Affected products

Tor: 0.1.1.26

References

http://events.ccc.de/congress/2006/Fahrplan/events/1513.en.html
http://www.cl.cam.ac.uk/~sjm217/papers/ccs06hotornot.pdf
http://www.lightbluetouchpaper.org/2006/09/04/hot-or-not-revealing-hidden-services-by-their-clock-skew/
http://events.ccc.de/congress/2006/Fahrplan/events/1513.en.html
http://www.cl.cam.ac.uk/~sjm217/papers/ccs06hotornot.pdf
http://www.lightbluetouchpaper.org/2006/09/04/hot-or-not-revealing-hidden-services-by-their-clock-skew/

Get alerted when CVE-2006-6893 or the next vulnerability affects your stack