CVE-2017-11104

Name: CVE-2017-11104
Creator: NVD / NIST
Published: 2017-07-08T10:29:00.17+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 2.68%

Last modified Jun 17, 2026

CVE-2017-11104 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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.. EPSS estimates a 2.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

2.68%

83.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Knot-Dns	Knot Dns	<= 2.4.4
Knot-Dns	Knot Dns	2.5.0
Knot-Dns	Knot Dns	2.5.1
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00076.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00078.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00089.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00049.htmlBroken Link
http://www.debian.org/security/2017/dsa-3910Third Party Advisory
http://www.securityfocus.com/bid/99598Broken Link
http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdfExploit, Mitigation, Patch, Third Party Advisory
https://bugs.debian.org/865678Issue Tracking, Third Party Advisory
https://lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.htmlBroken Link, Mailing List, Patch, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00076.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00078.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00089.htmlBroken Link
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00049.htmlBroken Link
http://www.debian.org/security/2017/dsa-3910Third Party Advisory
http://www.securityfocus.com/bid/99598Broken Link
http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdfExploit, Mitigation, Patch, Third Party Advisory
https://bugs.debian.org/865678Issue Tracking, Third Party Advisory
https://lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.htmlBroken Link, Mailing List, Patch, Third Party Advisory

Timeline

Published: Jul 8, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-11104?

How severe is CVE-2017-11104?

CVE-2017-11104 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 2.68% probability of exploitation in the next 30 days.

How do I fix CVE-2017-11104?

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-2017-11104?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST