TCP firewalls could be circumvented by sending a SYN Packets with other flags (like e.g
Published May 18, 2021
7.5
HIGHCVSS 3.1
EPSS 3.74%
Description
TCP firewalls could be circumvented by sending a SYN Packets with other flags (like e.g. RST flag) set, which was not correctly discarded by the Linux TCP stack after firewalling.
Affected products
- Vendor n/a Product Kernel Defaultn/a
- Version before Linux kernel 2.4.20StatusaffectedConstraints-
- 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 | Kernel | n/a |
|
- < 2.4.20
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the Linux kernels as shipped with Red Hat Enterprise Linux 4, 5, 6, and Red Hat Enterprise MRG.
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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.74% (0.03742) | 89.51th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.74% (0.03742) | 88.41th | v5 (v2026.06.15) |
| May 20, 2026 | 8.19% (0.08187) | 92.28th | v4 (v2025.03.14) |
| Dec 4, 2025 | 6.20% (0.06200) | 90.48th | v4 (v2025.03.14) |
| May 26, 2025 | 4.66% (0.04663) | 88.76th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.52% (0.01524) | 79.99th | v4 (v2025.03.14) |
| Dec 17, 2024 | 3.08% (0.03082) | 90.81th | v3 (v2023.03.01) |
| Feb 29, 2024 | 0.40% (0.00398) | 72.96th | v3 (v2023.03.01) |
| Feb 1, 2024 | 0.40% (0.00398) | 70.94th | v3 (v2023.03.01) |
| Dec 23, 2023 | 0.37% (0.00366) | 69.54th | v3 (v2023.03.01) |
| Apr 17, 2023 | 0.31% (0.00314) | 65.73th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.38% (0.00382) | 68.75th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
References (19)
- http://www.openwall.com/lists/oss-security/2012/02/03/7 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/29/8 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/30/11 mailing-listx_refsource_MLISTExploitMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/30/12 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/30/13 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/30/2 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/30/4 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/30/8 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/30/9 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2012/05/31/3 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://www.openwall.com/lists/oss-security/2014/02/12/8 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2002-2438 Vendor Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=744994%2C x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2002-2438
- https://security.netapp.com/advisory/ntap-20210727-0003/ x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2002-2438
- https://www.kb.cert.org/vuls/id/464113 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- https://www.kb.cert.org/vuls/id/464113%2C x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2012/02/03/7 x_refsource_MISCMailing ListPatchThird Party Advisory
Change history (0)
No recorded changes yet.