CVE-2022-34294: totd 1.5.3 uses a fixed UDP source port in upstream queries sent to DNS resolvers

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2022-34294 is a critical-severity flaw (CVSS 9.8) affecting totd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

totd 1.5.3 uses a fixed UDP source port in upstream queries sent to DNS resolvers. This allows DNS cache poisoning because there is not enough entropy to prevent traffic injection attacks.

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-331
Published	2022-08-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: totd project

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

Am I affected?

Timeline

2022-08-15 12:15 UTCPublished CVE record published
2026-06-17 04:50 UTCUpdated Record last modified

totd project totd DOWNGRADE

Affected: 1.5.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.5.3

1. Check installed version

apt-cache policy totd || rpm -q totd || totd --version

2. No fixed release: DOWNGRADE to a release before 1.5.3 (Debian / Ubuntu)

apt-cache madison totd sudo apt install totd=<VERSION_BEFORE_1.5.3> sudo apt-mark hold totd

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list totd sudo dnf downgrade totd-<VERSION_BEFORE_1.5.3> sudo dnf versionlock add totd

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2022-34294?

totd: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-34294 being exploited?

CVE-2022-34294 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-2022-34294 affect?

CVE-2022-34294 affects totd. Severity is critical (CVSS 9.8). totd 1.5.3 uses a fixed UDP source port in upstream queries sent to DNS resolvers. This allows DNS cache poisoning because there is not enough entropy to prevent traffic injection attacks.

How urgent is CVE-2022-34294?

Priority 64/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-34295 MEDIUM 6.5 UPGRADE totd before 1.5.3 does not properly randomize mesg IDs.

References

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