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Fencer Vulns
medium 5.9

CVE-2017-11104 json

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 va…

published 2017-07-08 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-2741

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • knot Debian 14, Debian 13, Debian 12 2.5.3-1

debian advisories DEBIAN-CVE-2017-11104

  • knot Package Hub 15 SP2 1.6.8-bp152.4.3.1
  • knot Package Hub 15 SP1 1.6.8-bp151.4.3.1
  • knot openSUSE Leap 15.2 1.6.8-lp152.5.3.1
  • knot openSUSE Leap 15.1 1.6.8-lp151.4.3.1

opensuse advisories openSUSE-SU-2020:1232-1openSUSE-SU-2020:1112-1openSUSE-SU-2020:1086-1openSUSE-SU-2020:1085-1

  • knot Alpine 3.6 2.4.5-r0

alpine advisories ALPINE-CVE-2017-11104

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-11104 updated cvss 7.5

knot: TSIG authentication bypass due to improper TSIG validity period check

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.68% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • synacktiv.ninja http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.