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CVE-2021-22053 is a vulnerability in applications using both spring-cloud-netflix-hystrix-dashboard and spring-boot-starter-thymeleaf. The issue arises when a request is made to /hystrix/monitor;[user-provided data], where the path elements after hystrix/monitor are evaluated as Spring Expression Language (SpringEL) expressions during Thymeleaf view template resolution. This allows attackers to inject and execute arbitrary code via crafted request URIs.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
/hystrix/monitor endpoint, implement input validation to prevent malicious SpringEL expressions, and use web application firewalls to block suspicious requests targeting this path.Patch, then assume compromise.
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No public activity tracked yet. Mallory keeps watching.
No public activity observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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