Security readout for executives and security teams
Plain-English summary
This issue weakens an expected protective control on pfSense 2.4.4_1. Failed HTTPS logins may not trigger source-IP blocking consistently with failed SSH logins, so administrators may have overestimated brute-force resistance for the web management interface.
Executive priority
Treat this as a firewall administration hardening issue. Prioritize internet-exposed or broadly reachable management interfaces first, because weak lockout behavior can increase password-attack risk against a high-value control plane.
Technical view
CVE-2018-20799 describes inconsistent source-IP blocking behavior between pfSense HTTPS authentication failures and SSH authentication failures, contrary to sshguard documentation. The public bundle does not provide CVSS, CWE, exploit details, or a confirmed fixed version.
Likely exposure
Exposure is most relevant where pfSense 2.4.4_1 HTTPS management is reachable from untrusted networks, especially WAN or broad internal segments. Systems without exposed HTTPS administration have lower practical exposure.
Exploitation context
The sources do not report active exploitation, and the CVE is not listed as KEV. The described risk is bypassing intended access restrictions around repeated failed HTTPS authentication attempts, not remote code execution.
Researcher notes
Evidence is limited to the CVE description and pfSense Redmine reference. No CVSS vector, CWE mapping, exploit status, or explicit remediation text is included in the supplied bundle, so validation should focus on exposure and vendor guidance.
Mitigation direction
- Check current Netgate or pfSense guidance for fixed versions or configuration advice.
- Upgrade affected pfSense systems according to vendor-supported maintenance guidance.
- Restrict HTTPS management access to trusted admin networks or VPN only.
- Avoid exposing the pfSense web interface directly to the internet.
- Monitor failed web-management logins and source-IP blocking behavior.
Validation and detection
- Inventory pfSense installations and identify any running 2.4.4_1.
- Confirm whether HTTPS management is reachable from WAN or untrusted networks.
- Review authentication and blocking logs for repeated HTTPS failures.
- Verify whether configured lockout behavior matches operational expectations.
- Document compensating controls for any system awaiting upgrade guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-20799 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://redmine.pfsense.org/issues/9223CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.