The Hidden Service (HS) client implementation in Tor before 0.2.4.27, 0.2.5.x before 0.2.5.12, and 0.2.6.x before 0.2.6.7 allows remote servers to cause a denial of service (assertion failure and application exit) via a malformed HS descriptor
Published Jan 24, 2020
7.5
HIGHCVSS 3.1
EPSS 1.16%
Description
The Hidden Service (HS) client implementation in Tor before 0.2.4.27, 0.2.5.x before 0.2.5.12, and 0.2.6.x before 0.2.6.7 allows remote servers to cause a denial of service (assertion failure and application exit) via a malformed HS descriptor.
Affected products
-
- Version 0.2.5.x before 0.2.5.12StatusaffectedConstraints-
- Version 0.2.6.x before 0.2.6.7StatusaffectedConstraints-
- Version before 0.2.4.27StatusaffectedConstraints-
- 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 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| The Tor Project | Tor | n/a |
|
- < 0.2.4.27
- ≥ 0.2.5.1 · < 0.2.5.12
- ≥ 0.2.6.1 · < 0.2.6.7
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
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
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.16% (0.01161) | 65.97th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.16% (0.01161) | 62.91th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.47% (0.00468) | 62.46th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.12% (0.00116) | 47.12th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.12% (0.00116) | 45.90th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00116) | 43.82th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.89% (0.00885) | 26.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
No CWE recorded.
References (2)
- http://openwall.com/lists/oss-security/2015/04/06/5 x_refsource_MISCMailing ListThird Party Advisory
- https://trac.torproject.org/projects/tor/ticket/15601 x_refsource_MISCVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://openwall.com/lists/oss-security/2015/04/06/5 | x_refsource_MISCMailing ListThird Party Advisory | |
| https://trac.torproject.org/projects/tor/ticket/15601 | x_refsource_MISCVendor Advisory |
Change history (0)
No recorded changes yet.