Knot DNS before 2.4.5 and 2.5.x before 2.5.2 contains a flaw within the TSIG protocol implementation that would allow an attacker with a valid key name and algorithm to bypass TSIG authentication if no additional ACL restrictions are set, because of an improper TSIG validity period check
Published Jul 8, 2017
5.9
MEDIUMCVSS 3.1
EPSS 2.68%
Description
Knot DNS before 2.4.5 and 2.5.x before 2.5.2 contains a flaw within the TSIG protocol implementation that would allow an attacker with a valid key name and algorithm to bypass TSIG authentication if no additional ACL restrictions are set, because of an improper TSIG validity period check.
Affected products
No data.
Configuration 1
Configuration 2
- 8.0
- 9.0
- 10.0
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:H/PR:N/UI:N/S:U/C:N/I:H/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
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 (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.68% (0.02681) | 85.30th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.68% (0.02681) | 83.82th | v5 (v2026.06.15) |
| Mar 30, 2025 | 2.58% (0.02579) | 84.22th | v4 (v2025.03.14) |
| Mar 29, 2025 | 5.74% (0.05740) | 83.68th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.16% (0.02156) | 83.10th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.27% (0.00267) | 68.53th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.27% (0.00267) | 66.73th | v3 (v2023.03.01) |
| May 8, 2023 | 0.27% (0.00267) | 62.70th | v3 (v2023.03.01) |
| Apr 23, 2023 | 0.23% (0.00229) | 59.51th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.22% (0.00222) | 58.66th | v3 (v2023.03.01) |
| Mar 6, 2023 | 16.31% (0.16306) | 96.13th | v2 (v2022.01.01) |
| Apr 1, 2022 | 16.31% (0.16306) | 95.78th | v2 (v2022.01.01) |
| Feb 4, 2022 | 16.31% (0.16306) | 92.84th | v2 (v2022.01.01) |
| Feb 3, 2022 | 8.66% (0.08659) | 85.81th | v1 |
| Jan 6, 2022 | 8.66% (0.08659) | 85.64th | v1 |
| Sep 1, 2021 | 8.66% (0.08659) | 92.95th | v1 |
| Apr 14, 2021 | 8.66% (0.08659) | 0.00th | v1 |
References (9)
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00076.html vendor-advisoryx_refsource_SUSEBroken Link
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00078.html vendor-advisoryx_refsource_SUSEBroken Link
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00089.html vendor-advisoryx_refsource_SUSEBroken Link
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00049.html vendor-advisoryx_refsource_SUSEBroken Link
- http://www.debian.org/security/2017/dsa-3910 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.securityfocus.com/bid/99598 vdb-entryx_refsource_BIDBroken Link
- http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdf x_refsource_MISCExploitMitigationPatchThird Party Advisory
- https://bugs.debian.org/865678 x_refsource_MISCIssue TrackingThird Party Advisory
- https://lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.html x_refsource_MISCBroken LinkMailing ListPatchThird Party Advisory
Change history (0)
No recorded changes yet.