HIGH
Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR
Published Feb 9, 2017
8.6
HIGHCVSS 3.1
EPSS 2.80%
Description
Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
8.6 HIGH NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality Impact None
Integrity Impact None
Availability Impact High
No CVSS v3.0 score for this CVE.
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.80% 0.02799
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02799
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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.80% (0.02799) | 85.96th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.75% (0.02746) | 84.21th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.20% (0.01196) | 77.46th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.61% (0.00610) | 79.34th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.61% (0.00610) | 77.97th | v3 (v2023.03.01) |
| May 16, 2023 | 0.61% (0.00610) | 75.55th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.86% (0.00864) | 79.80th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
Weaknesses (1)
References (7)
- http://www.openwall.com/lists/oss-security/2016/07/06/3 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2016/07/06/4 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/91678 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://github.com/sischkg/xfer-limit/blob/master/README.md x_refsource_MISCPatchThird Party Advisory
- https://gitlab.labs.nic.cz/labs/knot/blob/c546a70563ef4c7badb7cb5bdf6d1ba8e7adae82/NEWS x_refsource_CONFIRMRelease NotesVDB Entry
- https://gitlab.labs.nic.cz/labs/knot/issues/464 x_refsource_CONFIRMVendor Advisory
- https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html mailing-listx_refsource_MLISTTechnical Description
| Link | Providers | Tags |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2016/07/06/3 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.openwall.com/lists/oss-security/2016/07/06/4 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory | |
| http://www.securityfocus.com/bid/91678 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://github.com/sischkg/xfer-limit/blob/master/README.md | x_refsource_MISCPatchThird Party Advisory | |
| https://gitlab.labs.nic.cz/labs/knot/blob/c546a70563ef4c7badb7cb5bdf6d1ba8e7adae82/NEWS | x_refsource_CONFIRMRelease NotesVDB Entry | |
| https://gitlab.labs.nic.cz/labs/knot/issues/464 | x_refsource_CONFIRMVendor Advisory | |
| https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html | mailing-listx_refsource_MLISTTechnical Description |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Feb 9, 2017
Updated Aug 6, 2024
Reserved Jul 6, 2016
Link CVE-2016-6171
CISA Vulnrichment
Updated n/a