CVE-2021-30110: dttray.exe in Greyware Automation Products Inc Domain Time II before 5.2.b.20210331 allows remote attackers to

Q: How do I fix CVE-2021-30110?

domain time ii: upgrade to 5.2.b.20210331. Exact commands for each OS are on this page.

Q: Is CVE-2021-30110 being exploited?

CVE-2021-30110 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-2021-30110 affect?

CVE-2021-30110 affects domain time ii. Severity is high (CVSS 7.5). dttray.exe in Greyware Automation Products Inc Domain Time II before 5.2.b.20210331 allows remote attackers to execute arbitrary code via a URL to a malicious update in a spoofed response to the UDP query used to check for updates.

This month

HIGH 7.5UPGRADE

CVE-2021-30110 is a high-severity flaw (CVSS 7.5) affecting domain time ii. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

dttray.exe in Greyware Automation Products Inc Domain Time II before 5.2.b.20210331 allows remote attackers to execute arbitrary code via a URL to a malicious update in a spoofed response to the UDP query used to check for updates.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.0% (top 20%)
CISA exploited list	No
Published	2021-07-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: greyware

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

Am I affected?

Timeline

2021-07-22 13:15 UTCPublished CVE record published
2026-06-17 03:49 UTCUpdated Record last modified

greyware domain time ii UPGRADE

Affected: < 5.2.b.20210331

Fixed in: 5.2.b.20210331

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy domain-time-ii || rpm -q domain-time-ii || domain-time-ii --version

2. UPGRADE to 5.2.b.20210331 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade domain-time-ii

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade domain-time-ii

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-2021-30110?

domain time ii: upgrade to 5.2.b.20210331. Exact commands for each OS are on this page.

Is CVE-2021-30110 being exploited?

CVE-2021-30110 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-2021-30110 affect?

CVE-2021-30110 affects domain time ii. Severity is high (CVSS 7.5). dttray.exe in Greyware Automation Products Inc Domain Time II before 5.2.b.20210331 allows remote attackers to execute arbitrary code via a URL to a malicious update in a spoofed response to the UDP query used to check for updates.

How urgent is CVE-2021-30110?

Priority 46/100. High severity

References

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