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TI-2021-03955 Aliases CVE-2021-20729GHSA-gmq9-rc2w-2c75

Cross-site scripting in pfSense CE and pfSense Plus

Priority LOW 33CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

EPSS 0.02878 86th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
pfSensepfSense CE and pfSense PluspfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier—No fix listedCNA
  • pfSense CE and pfSense Plus VendorpfSense Affected pfSense CE software versions 2.5.2 and earlier, and pfSense Plus software versions 21.05 and earlier Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:netgate:pfsense_plus:*:*:*:*:*:*:*:*up to 21.05VulnerableNetgate
cpe:2.3:a:pfsense:pfsense:*:*:*:*:community:*:*:*up to 2.5.2VulnerablepfSense
  • cpe:2.3:a:netgate:pfsense_plus:*:*:*:*:*:*:*:* Versions up to 21.05 Vulnerable ·Netgate
  • cpe:2.3:a:pfsense:pfsense:*:*:*:*:community:*:*:* Versions up to 2.5.2 Vulnerable ·pfSense

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-20729
  2. 2026-10-03 Alias added: GHSA-gmq9-rc2w-2c75

References

Advisory 2

  • TI-2023-11923 Improper restriction of excessive authentication attempts in the SSHGuard component of… CVSS 3.1CRITICAL 9.8
  • TI-2021-18114 diag_routes.php in pfSense 2.5.2 allows sed data injection. CVSS 3.1HIGH 8.8
  • TI-2025-42916 Netgate pfSense CE 2.8.0 allows code execution in the XMLRPC API via pfsense.exec_php. CVSS 3.1CRITICAL 9.9
  • TI-2025-42915 Netgate pfSense CE 2.7.2 allows code execution by using the module installer with a… CVSS 3.1CRITICAL 9.1
  • TI-2026-74961 OS command injection in Netgate pfSense CE traffic shaper limiters CVSS 4.0HIGH 8.6
  • TI-2026-74960 OS command injection in Netgate pfSense CE via CARP VHID CVSS 4.0HIGH 8.6
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences