RCE in VMware Spring Cloud Netflix

CVE-2021-22053

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.

Vulnerability class: RCE (Remote Code Execution)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.132 (96.3th percentile), scored .

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-22053: held from 0.130 to 0.132.

EPSS over last 30 days · oldest: 0.130 · newest: 0.132 · change: +0.002

Affected products

  • VMware Spring Cloud Netflix
  • Spring Cloud Netflix — versions Spring Cloud Netflix versions 2.2.x prior to 2.2.10.Release + and old unsupported versions

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-22053?
CVE-2021-22053 is a high-severity vulnerability in VMware Spring Cloud Netflix, classified under Code Injection. CVSS score: 8.8/10. Published 2021-11-19.
How severe is CVE-2021-22053?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-22053 known to be exploited?
24 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.