PatchTheCVECVE-2011-2768: Tor before 0.2.2.34, when configured as a client or bridge, sends a TLS certificate chain as part of an outgoi
CVE-2011-2768 is a medium-severity flaw (CVSS 5.8) affecting tor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Tor before 0.2.2.34, when configured as a client or bridge, sends a TLS certificate chain as part of an outgoing OR connection, which allows remote relays to bypass intended anonymity properties by reading this chain and then determining the set of entry guards that the client or bridge had selected.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.8 (Medium) |
| EPSS exploit chance | 0.7% (top 46%) |
| CISA exploited list | No |
| Weakness | CWE-264 |
| Published | 2011-12-23 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2011-2768?
tor: upgrade to newer than 0.2.2.33. Exact commands for each OS are on this page.
Is CVE-2011-2768 being exploited?
CVE-2011-2768 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2011-2768 affect?
CVE-2011-2768 affects tor. Severity is medium (CVSS 5.8). Tor before 0.2.2.34, when configured as a client or bridge, sends a TLS certificate chain as part of an outgoing OR connection, which allows remote relays to bypass intended anonymity properties by reading this chain and then determining th
How urgent is CVE-2011-2768?
Priority 34/100. No elevated risk signals yet.
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