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
Published Jul 2, 2017
7.5
HIGHCVSS 3.0
EPSS 2.45%
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.
Affected products
- Vendor n/a Product Tor Defaultn/a
- Version TorStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Tor | n/a |
|
- 0.3.0.1
- 0.3.0.2
- 0.3.0.3
- 0.3.0.4
- 0.3.0.5
- 0.3.0.6
- 0.3.0.7
- 0.3.0.8
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.45% (0.02446) | 83.76th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.45% (0.02446) | 82.17th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.47% (0.00475) | 62.75th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.39% (0.00389) | 74.09th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.39% (0.00389) | 72.50th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.39% (0.00389) | 69.88th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.47% (0.00470) | 71.76th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.57% (0.01565) | 33.71th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.57% (0.01565) | 0.00th | v1 |
References (5)
- https://blog.torproject.org/blog/tor-0309-released-security-update-clients x_refsource_CONFIRMRelease NotesVendor Advisory
- https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients x_refsource_CONFIRMRelease NotesVendor Advisory
- https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350 x_refsource_CONFIRMPatchThird Party Advisory
- https://security-tracker.debian.org/CVE-2017-0377 x_refsource_CONFIRMThird Party Advisory
- https://trac.torproject.org/projects/tor/ticket/22753 x_refsource_CONFIRMIssue TrackingVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://blog.torproject.org/blog/tor-0309-released-security-update-clients | x_refsource_CONFIRMRelease NotesVendor Advisory | |
| https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients | x_refsource_CONFIRMRelease NotesVendor Advisory | |
| https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://security-tracker.debian.org/CVE-2017-0377 | x_refsource_CONFIRMThird Party Advisory | |
| https://trac.torproject.org/projects/tor/ticket/22753 | x_refsource_CONFIRMIssue TrackingVendor Advisory |
Change history (0)
No recorded changes yet.