In FreeBSD 12.0-STABLE before r349197 and 12.0-RELEASE before 12.0-RELEASE-p6, a bug in the non-default RACK TCP stack can allow an attacker to cause several linked lists to grow unbounded and cause an expensive list traversal on every packet being processed, leading to resource exhaustion and a denial of service
Published Jul 2, 2019
7.5
HIGHCVSS 3.0
EPSS 5.08%
Description
In FreeBSD 12.0-STABLE before r349197 and 12.0-RELEASE before 12.0-RELEASE-p6, a bug in the non-default RACK TCP stack can allow an attacker to cause several linked lists to grow unbounded and cause an expensive list traversal on every packet being processed, leading to resource exhaustion and a denial of service.
Affected products
- Vendor n/a Product FreeBSD Defaultn/a
- Version FreeBSD 12.0 before 12.0-RELEASE-p6StatusaffectedConstraints-
- 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 | FreeBSD | n/a |
|
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:C
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 2, 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 (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 5.08% (0.05085) | 92.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.23% (0.05226) | 91.42th | v5 (v2026.06.15) |
| Nov 21, 2025 | 9.79% (0.09795) | 92.65th | v4 (v2025.03.14) |
| Nov 18, 2025 | 12.36% (0.12359) | 93.21th | v4 (v2025.03.14) |
| Mar 30, 2025 | 9.79% (0.09795) | 92.22th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.69% (0.06692) | 85.01th | v4 (v2025.03.14) |
| Mar 17, 2025 | 5.04% (0.05042) | 89.02th | v4 (v2025.03.14) |
| Dec 17, 2024 | 2.69% (0.02685) | 90.14th | v3 (v2023.03.01) |
| Dec 12, 2024 | 4.47% (0.04469) | 92.75th | v3 (v2023.03.01) |
| Jun 25, 2024 | 4.99% (0.04993) | 92.88th | v3 (v2023.03.01) |
| Feb 27, 2024 | 4.02% (0.04021) | 91.80th | v3 (v2023.03.01) |
| Jun 8, 2023 | 3.99% (0.03992) | 90.77th | v3 (v2023.03.01) |
| May 23, 2023 | 3.52% (0.03517) | 90.18th | v3 (v2023.03.01) |
| May 6, 2023 | 2.51% (0.02512) | 88.52th | v3 (v2023.03.01) |
| Mar 7, 2023 | 2.59% (0.02586) | 88.60th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 16.31% (0.16306) | 92.84th | v2 (v2022.01.01) |
| Feb 3, 2022 | 11.51% (0.11512) | 88.34th | v1 |
| Jan 6, 2022 | 11.51% (0.11512) | 88.20th | v1 |
| Sep 1, 2021 | 2.82% (0.02818) | 80.51th | v1 |
| Apr 14, 2021 | 2.82% (0.02818) | 0.00th | v1 |
References (10)
- http://packetstormsecurity.com/files/153329/Linux-FreeBSD-TCP-Based-Denial-Of-Service.html x_refsource_MISCThird Party AdvisoryVDB Entry
- http://packetstormsecurity.com/files/153378/FreeBSD-Security-Advisory-FreeBSD-SA-19-08.rack.html x_refsource_MISCThird Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2019/06/17/5 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md x_refsource_MISCMitigationThird Party Advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193 x_refsource_MISCThird Party Advisory
- https://seclists.org/bugtraq/2019/Jun/27 mailing-listx_refsource_BUGTRAQMailing ListMitigationPatchThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:08.rack.asc vendor-advisoryx_refsource_FREEBSDMitigationVendor Advisory
- https://security.netapp.com/advisory/ntap-20190625-0004/ x_refsource_MISCThird Party Advisory
- https://support.f5.com/csp/article/K75521003 x_refsource_MISCThird Party Advisory
- https://www.kb.cert.org/vuls/id/905115 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
Change history (0)
No recorded changes yet.