CVE-2023-27100 json
Improper restriction of excessive authentication attempts in the SSHGuard component of Netgate pfSense Plus software v22.05.1 and pfSense C…
published 2023-03-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-30884
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 9.9%
- EPSS 9.9% chance of exploitation in 30 days, percentile 95%
- public exploits
- 1
- Exploit-DB
Summary
Improper restriction of excessive authentication attempts in the SSHGuard component of Netgate pfSense Plus software v22.05.1 and pfSense CE software v2.6.0 allows attackers to bypass brute force protection mechanisms via crafted web requests.
Patch / fix
- redmine.pfsense.org/issues/13574 advisory
Timeline
- Published
- First public exploit (EDB-51352)
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- total
- Assessed
- 20 mo ago
Exploit prediction
9.92% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- EDB-51352 pfsenseCE v2.6.0 - Anti-brute force protection bypass remote, 2023-04-08
- packetstorm.news https://packetstorm.news/files/id/171791 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Classification
- Weakness
-
- CWE-307 Improper Restriction of Excessive Authentication Attempts
References
-
redmine.pfsense.org
/issues/13574
issue-tracking, patch, vendor-advisory
-
packetstorm.news
/files/id/171791
exploit
-
docs.netgate.com
/downloads/pfSense-SA-23_05.sshguard.asc
vendor-advisory
- packetstormsecurity.com /files/171791/pfsenseCE-2.6.0-Protection-Bypass.html
Sources
- CVE List CVE-2023-27100
- NVD CVE-2023-27100
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.