How severe is CVE-2021-28811?

CVE-2021-28811 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28811?

CVE-2021-28811 affects Roonlabs Roon Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28811?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-28811 published?

CVE-2021-28811 was published on 2021-06-08 and last updated on 2026-06-17.

CVE-2021-28811

CVE-2021-28811 is a high-severity vulnerability in Roonlabs Roon Server with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Roonlabs Roon Server
Published: 2021-06-08
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-28811?: 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 severe is CVE-2021-28811?: CVE-2021-28811 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28811?: CVE-2021-28811 affects Roonlabs Roon Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28811?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-28811 published?: CVE-2021-28811 was published on 2021-06-08 and last updated on 2026-06-17.

References

https://www.qnap.com/zh-tw/security-advisory/qsa-21-17

Affected products (1)

cpe:2.3:a:roonlabs:roon_server:*:*:*:*:*:*:*:*

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