CVE-2019-19794: The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generat

Q: How do I fix CVE-2019-19794?

miekg-dns: upgrade to 1.1.25. Exact commands for each OS are on this page.

Q: Is CVE-2019-19794 being exploited?

CVE-2019-19794 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-2019-19794 affect?

CVE-2019-19794 affects miekg-dns. Severity is medium (CVSS 5.9). The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.

Q: How urgent is CVE-2019-19794?

Priority 51/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.9REMOTEUPGRADE

CVE-2019-19794 is a medium-severity flaw (CVSS 5.9) affecting miekg-dns. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-338
Published	2019-12-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: miekg-dns project

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

Am I affected?

Timeline

2019-12-13 22:15 UTCPublished CVE record published
2026-06-17 02:27 UTCUpdated Record last modified

miekg-dns project miekg-dns UPGRADE

Affected: < 1.1.25

Fixed in: 1.1.25

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.1.25 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade miekg-dns

Note

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

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-2019-19794?

miekg-dns: upgrade to 1.1.25. Exact commands for each OS are on this page.

Is CVE-2019-19794 being exploited?

CVE-2019-19794 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-2019-19794 affect?

CVE-2019-19794 affects miekg-dns. Severity is medium (CVSS 5.9). The miekg Go DNS package before 1.1.25, as used in CoreDNS before 1.6.6 and other products, improperly generates random numbers because math/rand is used. The TXID becomes predictable, leading to response forgeries.

How urgent is CVE-2019-19794?

Priority 51/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-15133 HIGH 7.5 UPGRADE A denial of service flaw was found in miekg-dns before 1.0.4

References

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