CVE-2017-0377
Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2017-0377- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2017-0377- Updated
- 2026-11-02
EUVDEUVD-2017-0731 No score
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.
- Record
EUVD-2017-0731- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vxgf-qp88-w686
Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not...
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.
- Record
GHSA-vxgf-qp88-w686- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2017-0377- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11469-1 No score
tor-0.4.6.7-2.2 on GA media
These are all security issues fixed in the tor-0.4.6.7-2.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11469-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
toropenSUSE:Tumbleweed |
before 0.4.6.7-2.2 | 0.4.6.7-2.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2017-0377 is a high vulnerability (CVSS 7.5) in Torproject Tor, published July 2, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.45%, the 84th percentile. Fixed in tor 0.4.6.7-2.2.
References
trac.torproject.org/projects/tor/ticket/22753
security-tracker.debian.org/CVE-2017-0377
blog.torproject.org/blog/tor-0309-released-security-update-clients
github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350
nvd.nist.gov/vuln/detail/CVE-2017-0377
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suse.com/security/cve/CVE-2016-1254