CVE-2021-3523

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-04-27 · updated 2026-06-17
Weakness: CWE-281

Description

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.

Affected products

apicast: before 2.11.0 — fixed in 2.11.0

How to fix

Upgrade to a fixed version: apicast 2.11.0. Check the vendor advisory for mitigations.

References

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

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