How severe is CVE-2021-21296?

CVE-2021-21296 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2021-21296 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21296?

CVE-2021-21296 affects Fleetdm Fleet. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21296?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-21296 published?

CVE-2021-21296 was published on 2021-02-10 and last updated on 2026-06-17.

CVE-2021-21296

CVE-2021-21296 is a low-severity vulnerability in Fleetdm Fleet with a CVSS 3.x base score of 2.7. 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-400.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
CVSS v2: 4.0
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Fleetdm Fleet
Published: 2021-02-10
Last modified: 2026-06-17

Description

Fleet is an open source osquery manager. In Fleet before version 3.7.0 a malicious actor with a valid node key can send a badly formatted request that causes the Fleet server to exit, resulting in denial of service. This is possible only while a live query is currently ongoing. We believe the impact of this vulnerability to be low given the requirement that the actor has a valid node key. There is no information disclosure, privilege escalation, or code execution. The issue is fixed in Fleet 3.7.0.

Frequently asked questions

What is CVE-2021-21296?: Fleet is an open source osquery manager. In Fleet before version 3.7.0 a malicious actor with a valid node key can send a badly formatted request that causes the Fleet server to exit, resulting in denial of service. This is possible only while a live query is currently ongoing. We believe the impact of this vulnerability to be low given the requirement that the actor has a valid node key. There is no information disclosure, privilege escalation, or code execution. The issue is fixed in Fleet 3.7.0.
How severe is CVE-2021-21296?: CVE-2021-21296 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2021-21296 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21296?: CVE-2021-21296 affects Fleetdm Fleet. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21296?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21296 published?: CVE-2021-21296 was published on 2021-02-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:node.js:*:*

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