CVE-2021-28811: If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands

Q: How do I fix CVE-2021-28811?

roon server: upgrade to 2021-05-18. Exact commands for each OS are on this page.

Q: Is CVE-2021-28811 being exploited?

CVE-2021-28811 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-2021-28811 affect?

CVE-2021-28811 affects roon server. Severity is high (CVSS 7.2). If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands. Roon Labs has already fixed this vulnerability in the following versions: Roon Server 2021-05-18 and later

This month

HIGH 7.2UPGRADE

CVE-2021-28811 is a high-severity flaw (CVSS 7.2) affecting roon server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands. Roon Labs has already fixed this vulnerability in the following versions: Roon Server 2021-05-18 and later

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.5% (top 27%)
CISA exploited list	No
Weakness	CWE-78, CWE-77
Published	2021-06-08
Last modified	2026-06-17

Publisher (CNA): QNAP Systems, Inc. · Vendor: roonlabs

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

Am I affected?

Timeline

2021-06-08 03:15 UTCPublished CVE record published
2026-06-17 03:46 UTCUpdated Record last modified

roonlabs roon server UPGRADE

Affected: < 2021-05-18

Fixed in: 2021-05-18

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy roon-server || rpm -q roon-server || roon-server --version

2. UPGRADE to 2021-05-18 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade roon-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade roon-server

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-2021-28811?

roon server: upgrade to 2021-05-18. Exact commands for each OS are on this page.

Is CVE-2021-28811 being exploited?

CVE-2021-28811 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-2021-28811 affect?

CVE-2021-28811 affects roon server. Severity is high (CVSS 7.2). If exploited, this command injection vulnerability could allow remote attackers to run arbitrary commands. Roon Labs has already fixed this vulnerability in the following versions: Roon Server 2021-05-18 and later

How urgent is CVE-2021-28811?

Priority 44/100. High severity

Related CVEs

CVE-2021-28810 HIGH 7.5 UPGRADE If exploited, this vulnerability allows an attacker to access resources which are not otherwise accessible wit

References

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