Home/CVE/Improper restriction of excessive authentication attempts in the SSHGuard component of Netgate pfSense Plus software v22
CVE

CVE-2023-27100

Improper restriction of excessive authentication attempts in the SSHGuard component of Netgate pfSense Plus software v22

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.

CRITICAL · CVSS 9.8 EPSS 0.03048
Act now
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-307Improper Restriction of Excessive Authentication Attempts
CWE-307Improper Restriction of Excessive Authentication Attempts
▤

Affected Products & Versions

2
netgate pfsense plusall versions
pfsenseall versions
⚠

Public Exploits & PoCs

3
remotepfsenseCE v2.6.0 - Anti-brute force protection bypass2023-04-08
pocpacketstormsecurity.com · pfsenseCE-2.6.0-Protection-Bypass.htmlpacketstormsecurity.com
pocpacketstorm.news · 171791packetstorm.news
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Mar 2023 · 11:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://docs.netgate.com/downloads/pfSense-SA-23_05.sshguard.ascVendor Advisory
https://redmine.pfsense.org/issues/13574Issue TrackingPatchVendor Advisory
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