What’s Vulnerable › Vulnerabilities

CVE-2021-42770

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-08 · updated 2026-06-17
• Weakness: CWE-79

Description

A Cross-site scripting (XSS) vulnerability was discovered in OPNsense before 21.7.4 via the LDAP attribute return in the authentication tester.

Affected products

• OPNsense: through 19.7.0; from 21.7.0 before 21.7.4 — fixed in 21.7.4

How to fix

Upgrade to a fixed version: OPNsense 21.7.4. Check the vendor advisory for mitigations.

References

• https://cert.orange.com
• https://github.com/orangecertcc/security-research/security/advisories/GHSA-r32j-xgg3-w2rw
• https://opnsense.org/opnsense-21-7-4-released/
• https://cert.orange.com
• https://github.com/orangecertcc/security-research/security/advisories/GHSA-r32j-xgg3-w2rw
• https://opnsense.org/opnsense-21-7-4-released/

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