CVE-2021-21322
10.0 · CRITICALOverview
CVE-2021-21322 is a critical-severity vulnerability affecting fastify-http-proxy_project fastify-http-proxy. It was published on March 2, 2021 and has a CVSS 3.1 base score of 10.0 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
fastify-http-proxy is an npm package which is a fastify plugin for proxying your http requests to another server, with hooks. By crafting a specific URL, it is possible to escape the prefix of the proxied backend service. If the base url of the proxied server is `/pub/`, a user expect that accessing `/priv` on the target service would not be possible. In affected versions, it is possible. This is fixed in version 4.3.1.
Remediation
Check the references section for vendor advisories and patches from fastify-http-proxy_project. Update fastify-http-proxy to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| fastify-http-proxy_project | fastify-http-proxy | >= 0, < 4.3.1 | Affected |
References
Frequently Asked Questions
What is CVE-2021-21322?
CVE-2021-21322 is a critical-severity vulnerability affecting fastify-http-proxy_project fastify-http-proxy. It was published on March 2, 2021 and has a CVSS 3.1 base score of 10.0 (CRITICAL).
How severe is CVE-2021-21322?
This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-21322?
Check the references section for vendor advisories and patches from fastify-http-proxy_project. Update fastify-http-proxy to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-21322?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-21322 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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