What’s Vulnerable › Vulnerabilities

CVE-2021-27516

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-22 · updated 2026-06-17

Description

URI.js (aka urijs) before 1.19.6 mishandles certain uses of backslash such as http:\/ and interprets the URI as a relative path.

Affected products

• medialize/uri.js: before 1.19.6 — fixed in 1.19.6

How to fix

Upgrade to a fixed version: medialize/uri.js 1.19.6. Check the vendor advisory for mitigations.

References

• https://advisory.checkmarx.net/advisory/CX-2021-4305
• https://github.com/medialize/URI.js/commit/a1ad8bcbc39a4d136d7e252e76e957f3ece70839
• https://github.com/medialize/URI.js/releases/tag/v1.19.6
• https://advisory.checkmarx.net/advisory/CX-2021-4305
• https://github.com/medialize/URI.js/commit/a1ad8bcbc39a4d136d7e252e76e957f3ece70839
• https://github.com/medialize/URI.js/releases/tag/v1.19.6

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