CVE-2021-3523 Security feature bypass in apicast

High 7.5 Published 27 Apr 2022 Updated 3 Aug 2024

Attackers can bypass API security restrictions by exploiting connection reuse flaws when multiple APIs share an IP address.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-3523?

CVE-2021-3523 is a high-severity vulnerability in apicast, published on 27 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-281

Which versions are affected by CVE-2021-3523?

It affects 1 product.

Products include Redhat Apicast.

How do I fix CVE-2021-3523?

No fix has been published for CVE-2021-3523 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-3523 being exploited?

There is no known exploitation of CVE-2021-3523 in the wild and no public exploit code.

CVE-2023-0456 Apicast proxies the api call with incorrect jwt token to the api backend without proper authorization check High 7.4

Sources

Also known as GHSA-wxqh-rqgc-pfr9.