CVE-2021-37580: Authentication Bypass in Apache ShenYu Admin

This vulnerability presents a significant risk because it allows attackers to bypass authentication entirely. An attacker can craft malicious JWTs to impersonate legitimate users, granting them full administrative access to the ShenYu Admin console. This access could be used to modify configurations, inject malicious code, steal sensitive data, or even compromise the entire ShenYu service mesh. The potential impact is severe, as ShenYu Admin is often used to manage and control critical infrastructure components. Successful exploitation could lead to widespread disruption and data breaches.

1. Reserved2021-07-27
2. Published2021-11-17
3. Modified2024-02-16
4. EPSS updated2026-04-02

The primary mitigation is to upgrade to Apache ShenYu Admin version 2.4.1 or later, which contains the fix for this vulnerability. If upgrading immediately is not possible, consider implementing temporary workarounds. While a direct WAF rule is difficult to implement due to the JWT nature, strict input validation on all parameters passed to the ShenYu Admin API can help reduce the attack surface. Monitoring JWT signature verification failures in ShenYu logs can provide early detection of potential attacks. After upgrading, confirm the fix by attempting to authenticate with a known valid JWT and verifying that authentication proceeds as expected.