Security readout for executives and security teams
Plain-English summary
CVE-2015-6511 is a cross-site scripting issue in pfSense before 2.2.3. An attacker could inject script or HTML through the NTP services page parameter named server[]. Business risk depends on whether vulnerable pfSense management interfaces are still deployed and reachable.
Executive priority
Treat this as a legacy perimeter-management risk. It is not shown as actively exploited in the provided sources, but vulnerable firewall administration interfaces deserve prompt inventory, upgrade confirmation, and access restriction.
Technical view
The CVE describes XSS in pfSense services_ntpd.php before version 2.2.3, using the server[] parameter as the injection point. The public bundle provides no CVSS score, CWE mapping, authentication context, or detailed exploit conditions.
Likely exposure
Exposure is limited to pfSense systems older than 2.2.3. Risk is higher where the pfSense WebGUI or affected NTP configuration workflow is reachable by untrusted users or networks.
Exploitation context
The source bundle does not show CISA KEV listing or cite active exploitation. It states remote attackers can inject arbitrary web script or HTML, but does not provide exploit prevalence or required privileges.
Researcher notes
Evidence is sparse: the CVE record identifies the product, fixed-before version, vulnerable page, and parameter. It does not include CVSS, CWE, authentication requirements, patch details beyond the 2.2.3 boundary, or exploit telemetry.
Mitigation direction
- Identify any pfSense systems running versions before 2.2.3.
- Review pfSense-SA-15_06.webgui for vendor remediation guidance.
- Upgrade affected pfSense deployments to 2.2.3 or later where applicable.
- Limit pfSense WebGUI access to trusted administrative networks.
- Review administrative accounts and browser-session exposure for impacted systems.
Validation and detection
- Inventory pfSense versions and flag any release before 2.2.3.
- Confirm whether services_ntpd.php exists on exposed management interfaces.
- Check whether pfSense WebGUI is reachable from untrusted networks.
- Review change records for upgrade to 2.2.3 or later.
- Check logs for suspicious WebGUI activity around NTP service configuration.
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-2015-6511 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://www.pfsense.org/security/advisories/pfSense-SA-15_06.webgui.ascCVE reference · x_refsource_CONFIRM
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.