CVE-2021-20729 json
Cross-site scripting vulnerability in pfSense CE and pfSense Plus (pfSense CE software versions 2.5.2 and earlier, and pfSense Plus softwar…
published 2022-03-31 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8143
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.9%
- EPSS 2.9% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
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.
Exploit prediction
2.88% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- pfSense pfSense CE and pfSense Plus
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
docs.netgate.com
/downloads/pfSense-SA-21_02.captiveportal.asc
third-party-advisory
-
jvn.jp
/en/jp/JVN87751554/index.html
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-20729
- NVD CVE-2021-20729
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