CVE-2021-22053
Published: April 11, 2026
Official Description
Applications using both `spring-cloud-netflix-hystrix-dashboard` and `spring-boot-starter-thymeleaf` expose a way to execute code submitted within the request URI path during the resolution of view templates. When a request is made at `/hystrix/monitor;[user-provided data]`, the path elements following `hystrix/monitor` are being evaluated as SpringEL expressions, which can lead to code execution.
Risk Analysis
Applications using both spring-cloud-netflix-hystrix-dashboard and spring-boot-starter-thymeleaf are vulnerable to code execution. An attacker can submit code within the request URI path, which is then evaluated as SpringEL expressions. The confirmed exploitation in the wild makes this a high-priority vulnerability.
This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog. Attackers are leveraging this flaw for code execution.
Developers should update to patched versions of spring-cloud-netflix-hystrix-dashboard and spring-boot-starter-thymeleaf. Implement robust input validation and sanitize all user-provided data in request URIs.
Technical Analysis
CVE-2021-22053 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-22053 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-22053 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1