What’s Vulnerable › Vulnerabilities

CVE-2021-20729

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-31 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier) allows a remote attacker to inject an arbitrary script via a malicious URL.

Affected products

• Netgate Pfsense Plus: through 21.05
• Netgate pfSense CE: through 2.5.2

References

• https://docs.netgate.com/downloads/pfSense-SA-21_02.captiveportal.asc
• https://jvn.jp/en/jp/JVN87751554/index.html
• https://docs.netgate.com/downloads/pfSense-SA-21_02.captiveportal.asc
• https://jvn.jp/en/jp/JVN87751554/index.html

Get alerted when CVE-2021-20729 or the next vulnerability affects your stack