How severe is CVE-2021-28938?

CVE-2021-28938 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-28938 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28938?

CVE-2021-28938 affects Siren Federate. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28938?

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

When was CVE-2021-28938 published?

CVE-2021-28938 was published on 2021-04-13 and last updated on 2026-06-17.

CVE-2021-28938

CVE-2021-28938 is a medium-severity vulnerability in Siren Federate with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Siren Federate
Published: 2021-04-13
Last modified: 2026-06-17

Description

Siren Federate before 6.8.14-10.3.9, 6.9.x through 7.6.x before 7.6.2-20.2, 7.7.x through 7.9.x before 7.9.3-21.6, 7.10.x before 7.10.2-22.2, and 7.11.x before 7.11.2-23.0 can leak user information across thread contexts. This occurs in opportunistic circumstances when there is concurrent query execution by a low-privilege user and a high-privilege user. The former query might run with the latter query's privileges.

Frequently asked questions

What is CVE-2021-28938?: Siren Federate before 6.8.14-10.3.9, 6.9.x through 7.6.x before 7.6.2-20.2, 7.7.x through 7.9.x before 7.9.3-21.6, 7.10.x before 7.10.2-22.2, and 7.11.x before 7.11.2-23.0 can leak user information across thread contexts. This occurs in opportunistic circumstances when there is concurrent query execution by a low-privilege user and a high-privilege user. The former query might run with the latter query's privileges.
How severe is CVE-2021-28938?: CVE-2021-28938 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-28938 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28938?: CVE-2021-28938 affects Siren Federate. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28938?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28938 published?: CVE-2021-28938 was published on 2021-04-13 and last updated on 2026-06-17.

References

https://docs.siren.io/siren-federate-user-guide/22/siren-federate/release-notes.html

Affected products (1)

cpe:2.3:a:siren:federate:*:*:*:*:*:elasticsearch:*:*