CVE-2017-0377

Name: CVE-2017-0377
Creator: NVD / NIST
Published: 2017-07-02T15:29:00.187+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.45%

Last modified Jun 17, 2026

CVE-2017-0377 is a vulnerability of currently unknown severity. Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote attackers to defeat intended anonymity properties by leveraging the existence of large families.. EPSS estimates a 2.45% chance of exploitation in the next 30 days.

Description

Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote attackers to defeat intended anonymity properties by leveraging the existence of large families.

Metrics

EPSS Probability

2.45%

82.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions	Update
Torproject	Tor	0.3.0.1	Alpha
Torproject	Tor	0.3.0.2	Alpha
Torproject	Tor	0.3.0.3	Alpha
Torproject	Tor	0.3.0.4	—
Torproject	Tor	0.3.0.5	—
Torproject	Tor	0.3.0.6	—
Torproject	Tor	0.3.0.7	—
Torproject	Tor	0.3.0.8	—

References

https://blog.torproject.org/blog/tor-0309-released-security-update-clientsRelease Notes, Vendor Advisory
https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clientsRelease Notes, Vendor Advisory
https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350Patch, Third Party Advisory
https://security-tracker.debian.org/CVE-2017-0377Third Party Advisory
https://trac.torproject.org/projects/tor/ticket/22753Issue Tracking, Vendor Advisory
https://blog.torproject.org/blog/tor-0309-released-security-update-clientsRelease Notes, Vendor Advisory
https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clientsRelease Notes, Vendor Advisory
https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350Patch, Third Party Advisory
https://security-tracker.debian.org/CVE-2017-0377Third Party Advisory
https://trac.torproject.org/projects/tor/ticket/22753Issue Tracking, Vendor Advisory

Timeline

Published: Jul 2, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-0377?

How severe is CVE-2017-0377?

Severity scoring for CVE-2017-0377 is pending analysis. The EPSS model estimates a 2.45% probability of exploitation in the next 30 days.

How do I fix CVE-2017-0377?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-0377?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST