CVE-2017-11104: Knot DNS before 2.4.5 and 2.5.x before 2.5.2 contains a flaw within the TSIG protocol implementation that woul

Q: How do I fix CVE-2017-11104?

knot dns: upgrade to newer than 2.4.4; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2017-11104 being exploited?

CVE-2017-11104 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-11104 affect?

CVE-2017-11104 affects knot dns, debian linux. Severity is medium (CVSS 5.9). 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, b

Q: How urgent is CVE-2017-11104?

Priority 57/100. Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

MEDIUM 5.9REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2017-11104 is a medium-severity flaw (CVSS 5.9) affecting knot dns, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-20
Published	2017-07-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · knot-dns

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-07-08 10:29 UTCPublished CVE record published
2026-06-17 01:01 UTCUpdated Record last modified

knot-dns knot dns UPGRADE

Affected: <= 2.4.4 · 2.5.0 · 2.5.1

Fixed in: newer than 2.4.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy knot-dns || rpm -q knot-dns || knot-dns --version

2. UPGRADE to newer than 2.4.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade knot-dns

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade knot-dns

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 8.0 · 9.0 · 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-11104?

knot dns: upgrade to newer than 2.4.4; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-11104 being exploited?

CVE-2017-11104 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-11104 affect?

CVE-2017-11104 affects knot dns, debian linux. Severity is medium (CVSS 5.9). 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, b

How urgent is CVE-2017-11104?

Priority 57/100. Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2016-6171 HIGH 8.6 UPGRADE Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave serv

References

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