CVE-2016-6171
HIGHCVSS 8.6/10EPSS 2.82%
Last modified
CVE-2016-6171 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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.. EPSS estimates a 2.82% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Knot-Dns | Knot Dns | < 2.3.0 |
References
- http://www.openwall.com/lists/oss-security/2016/07/06/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/07/06/4Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/91678Third Party Advisory, VDB Entry
- https://github.com/sischkg/xfer-limit/blob/master/README.mdPatch, Third Party Advisory
- https://gitlab.labs.nic.cz/labs/knot/blob/c546a70563ef4c7badb7cb5bdf6d1ba8e7adae82/NEWSRelease Notes, VDB Entry
- https://gitlab.labs.nic.cz/labs/knot/issues/464Vendor Advisory
- https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.htmlTechnical Description
- http://www.openwall.com/lists/oss-security/2016/07/06/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/07/06/4Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/91678Third Party Advisory, VDB Entry
- https://github.com/sischkg/xfer-limit/blob/master/README.mdPatch, Third Party Advisory
- https://gitlab.labs.nic.cz/labs/knot/blob/c546a70563ef4c7badb7cb5bdf6d1ba8e7adae82/NEWSRelease Notes, VDB Entry
- https://gitlab.labs.nic.cz/labs/knot/issues/464Vendor Advisory
- https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.htmlTechnical Description
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2016-6171?
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.
How severe is CVE-2016-6171?
CVE-2016-6171 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 2.82% probability of exploitation in the next 30 days.
How do I fix CVE-2016-6171?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2016-6171?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST