What is CVE-2021-23664?

CVE-2021-23664 is a high-severity vulnerability in Isomorphic-Git Cors-Proxy, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2022-01-21.

How severe is CVE-2021-23664?

High severity. CVSS v3 base score is 8.6 out of 10.

SSRF in Isomorphic-Git Cors-Proxy

CVE-2021-23664

The package @isomorphic-git/cors-proxy before 2.7.1 are vulnerable to Server-side Request Forgery (SSRF) due to missing sanitization and validation of the redirection action in middleware.js.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2022-01-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.014 (71.4th percentile), scored 2026-10-06.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Isomorphic-Git Cors-Proxy
@Isomorphic-Git/cors-Proxy — versions unspecified

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

snyk.io/vuln/SNYK-JS-ISOMORPHICGITCORSPROXY-1734788 (Exploit, Patch, Third Party Advisory)
github.com/isomorphic-git/cors-proxy/commit/1b1c91e71d946544d97ccc7cf0ac62b859e… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-23664?: CVE-2021-23664 is a high-severity vulnerability in Isomorphic-Git Cors-Proxy, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2022-01-21.
How severe is CVE-2021-23664?: High severity. CVSS v3 base score is 8.6 out of 10.