An issue was discovered in Suricata 5.0.0
Published Jan 6, 2020
9.1
CRITICALCVSS 3.1
EPSS 2.52%
Description
An issue was discovered in Suricata 5.0.0. It is possible to bypass/evade any tcp based signature by overlapping a TCP segment with a fake FIN packet. The fake FIN packet is injected just before the PUSH ACK packet we want to bypass. The PUSH ACK packet (containing the data) will be ignored by Suricata because it overlaps the FIN packet (the sequence and ack number are identical in the two packets). The client will ignore the fake FIN packet because the ACK flag is not set. Both linux and windows clients are ignoring the injected packet.
Affected products
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:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:P/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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.52% (0.02521) | 84.28th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.52% (0.02521) | 82.74th | v5 (v2026.06.15) |
| Oct 5, 2025 | 0.18% (0.00183) | 40.40th | v4 (v2025.03.14) |
| Jul 20, 2024 | 1.05% (0.01046) | 84.17th | v3 (v2023.03.01) |
| May 1, 2024 | 1.05% (0.01046) | 83.81th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.48% (0.01478) | 84.72th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 7.18% (0.07176) | 80.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.36% (0.05363) | 79.74th | v1 |
| Jan 6, 2022 | 5.36% (0.05363) | 79.54th | v1 |
| Sep 1, 2021 | 1.25% (0.01247) | 68.62th | v1 |
| Apr 14, 2021 | 1.25% (0.01247) | 0.00th | v1 |
References (5)
- https://github.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4b x_refsource_CONFIRMPatchThird Party Advisory
- https://github.com/OISF/suricata/commit/fa692df37a796c3330c81988d15ef1a219afc006 x_refsource_CONFIRMPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html mailing-listx_refsource_MLISTThird Party Advisory
- https://redmine.openinfosecfoundation.org/issues/3324 x_refsource_MISCExploitThird Party Advisory
- https://redmine.openinfosecfoundation.org/issues/3394 x_refsource_MISCExploitThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/OISF/suricata/commit/1c63d3905852f746ccde7e2585600b2199cefb4b | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://github.com/OISF/suricata/commit/fa692df37a796c3330c81988d15ef1a219afc006 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2020/01/msg00032.html | mailing-listx_refsource_MLISTThird Party Advisory | |
| https://redmine.openinfosecfoundation.org/issues/3324 | x_refsource_MISCExploitThird Party Advisory | |
| https://redmine.openinfosecfoundation.org/issues/3394 | x_refsource_MISCExploitThird Party Advisory |
Change history (0)
No recorded changes yet.