CVE-2021-3523

7.5 highEPSS 0.8%

High (7.5) in redhat apicast. EPSS 0.8% chance of exploitation in the next 30 days.

A flaw was found in 3Scale APICast in versions prior to 2.11.0, where it incorrectly identified connections for reuse. This flaw allows an attacker to bypass security restrictions for an API request when hosting multiple APIs on the same IP address.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-31)
CWE: CWE-281
Published: 2022-04-27
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

redhat:apicast

References

https://bugzilla.redhat.com/show_bug.cgi?id=1954805
https://bugzilla.redhat.com/show_bug.cgi?id=1954805

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