CVE-2017-11104 Auth bypass in n/a

What is CVE-2017-11104?

CVE-2017-11104 is a medium-severity authentication bypass vulnerability in Debian Debian Linux, published on 8 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-20

Which versions are affected by CVE-2017-11104?

It affects 2 products.

Products include Debian Debian Linux, Knot-Dns Knot Dns.

How do I fix CVE-2017-11104?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2017-11104 being exploited?

There is no known exploitation of CVE-2017-11104 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CVE-2017-1000216, DEBIAN-CVE-2017-11104, DSA-3910-1, GHSA-xhxv-xr8w-7xpm, UBUNTU-CVE-2017-11104, openSUSE-SU-2020:1085-1 and 3 more.