In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler
Published Feb 21, 2019
7.5
HIGHCVSS 3.0
EPSS 4.57%
Description
In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.
Affected products
No data.
- < 0.3.3.12
- ≥ 0.3.4.8 · < 0.3.4.11
- 0.3.4.0
- 0.3.4.1
- 0.3.4.2
- 0.3.4.3
- 0.3.4.4
- 0.3.4.5
- 0.3.4.6
- 0.3.4.7
- 0.3.5.0
- 0.3.5.1
- 0.3.5.2
- 0.3.5.3
- 0.3.5.4
- 0.3.5.5
- 0.3.5.6
- 0.3.5.7
- 0.4.0.1
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:N/I:N/A:H
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
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (22 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.57% (0.04572) | 91.33th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.57% (0.04572) | 90.37th | v5 (v2026.06.15) |
| Feb 1, 2026 | 1.04% (0.01038) | 77.10th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.04% (0.02042) | 82.24th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.62% (0.04622) | 81.73th | v4 (v2025.03.14) |
| Jul 20, 2024 | 1.66% (0.01659) | 87.78th | v3 (v2023.03.01) |
| Jul 14, 2024 | 1.66% (0.01659) | 87.77th | v3 (v2023.03.01) |
| Jun 1, 2024 | 1.95% (0.01954) | 88.69th | v3 (v2023.03.01) |
| Mar 21, 2024 | 1.96% (0.01959) | 88.45th | v3 (v2023.03.01) |
| Feb 15, 2024 | 1.97% (0.01974) | 88.37th | v3 (v2023.03.01) |
| Jul 20, 2023 | 2.38% (0.02383) | 88.36th | v3 (v2023.03.01) |
| May 19, 2023 | 2.50% (0.02501) | 88.55th | v3 (v2023.03.01) |
| Mar 17, 2023 | 1.78% (0.01778) | 86.12th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.08% (0.02079) | 87.29th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 17, 2023 | 1.21% (0.01213) | 66.22th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.18% (0.07176) | 80.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 6.89% (0.06891) | 83.32th | v1 |
| Jan 6, 2022 | 6.89% (0.06891) | 83.16th | v1 |
| Sep 1, 2021 | 1.62% (0.01623) | 73.32th | v1 |
| Apr 14, 2021 | 1.62% (0.01623) | 0.00th | v1 |
References (4)
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00013.html vendor-advisoryx_refsource_SUSE
- http://www.securityfocus.com/bid/107136 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://blog.torproject.org/new-releases-tor-0402-alpha-0358-03411-and-03312 x_refsource_MISCVendor Advisory
- https://trac.torproject.org/projects/tor/ticket/29168 x_refsource_MISCVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00013.html | vendor-advisoryx_refsource_SUSE | |
| http://www.securityfocus.com/bid/107136 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://blog.torproject.org/new-releases-tor-0402-alpha-0358-03411-and-03312 | x_refsource_MISCVendor Advisory | |
| https://trac.torproject.org/projects/tor/ticket/29168 | x_refsource_MISCVendor Advisory |
Change history (0)
No recorded changes yet.