Security readout for executives and security teams
Plain-English summary
NfSen versions before 1.3.8 contain a command-injection flaw in the custom output format feature. An attacker who can reach and use that feature may run operating system commands on the server. Treat exposed or legacy NfSen deployments as urgent to identify and upgrade.
Executive priority
High priority for any organization still running legacy NfSen. The issue can lead to server command execution, but urgency depends on whether the NfSen interface is reachable and whether vulnerable versions remain deployed.
Technical view
CVE-2017-7175 affects NfSen before 1.3.8. The customfmt parameter, described as the Custom output format field, improperly handles shell metacharacters and can permit arbitrary OS command execution. The source bundle does not provide CVSS, CWE, CPE, authentication requirements, or privilege context.
Likely exposure
Exposure is most likely where NfSen before 1.3.8 remains deployed, especially if the web interface is reachable beyond trusted administrators. The bundle does not identify downstream packaged products or precise CPEs.
Exploitation context
A public Exploit-DB entry exists, so exploit details have been publicly available. The CVE is not listed as KEV in the provided bundle, and no cited source confirms active exploitation.
Researcher notes
Evidence is limited but clear on the core bug: command injection through customfmt before 1.3.8. The bundle lacks CVSS, CWE, CPEs, authentication details, and confirmed exploitation status, so avoid assuming exploitability conditions beyond reachable vulnerable functionality.
Mitigation direction
- Upgrade NfSen to 1.3.8 or later.
- Prioritize systems reachable from the internet or broad internal networks.
- Restrict NfSen access to trusted administrative users and networks.
- Review vendor release notes and local packaging guidance.
- Monitor affected hosts for suspicious web requests and child processes.
Validation and detection
- Inventory all NfSen instances and record installed versions.
- Confirm no production instance is older than 1.3.8.
- Identify whether NfSen interfaces are externally reachable.
- Review logs for unusual customfmt parameter use.
- Check host telemetry for unexpected OS command execution.
- Document upgrade status and residual access restrictions.
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-2017-7175 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://sourceforge.net/p/nfsen/news/2017/01/nfsen-138-released---security-fix/CVE reference · x_refsource_CONFIRM
- 42314CVE reference · exploit, x_refsource_EXPLOIT-DB
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.