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CVE-2017-0377

26
FAUCET Score

CVE-2017-0377 describes a vulnerability in Tor 0.3.x before 0.3.0.9, where the guard-selection algorithm fails to consider the entire family of an exit relay, impacting user anonymity. This vulnerability carries a CVSS v3 score of 7.5 (HIGH), indicating a network-based attack with low complexity that could lead to high confidentiality impact. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
0.3.0.1CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.3.0.1:alpha:*:*:*:*:*:*
0.3.0.2CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.3.0.2:alpha:*:*:*:*:*:*
0.3.0.3CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.3.0.3:alpha:*:*:*:*:*:*
0.3.0.4CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.3.0.4:*:*:*:*:*:*:*
0.3.0.5CPE matchmatch criteria
cpe:2.3:a:torproject:tor:0.3.0.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.45%
Probability of exploitation in next 30 days
EPSS Percentile
82.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0245 is in the 69th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

blog.torproject.org / blog/tor-0309-released-security-update-clients
Release NotesVendor Advisory
blog.torproject.org / blog/tor-0314-alpha-released-security-update-clients
Release NotesVendor Advisory
github.com / torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350
PatchThird Party Advisory
security-tracker.debian.org / CVE-2017-0377
Third Party Advisory
trac.torproject.org / projects/tor/ticket/22753
Issue TrackingVendor Advisory