Security readout for executives and security teams
Plain-English summary
Some NET&SYS network management devices may reveal stored credentials to a remote party through SNMP queries. The business risk is unauthorized access to managed infrastructure if SNMP is reachable. The source bundle does not identify a vendor fix, CVSS score, or confirmed exploitation.
Executive priority
Treat this as high priority for any exposed management network. Credential disclosure can turn a device issue into wider infrastructure compromise. Priority is lower if affected devices are absent or SNMP is tightly isolated.
Technical view
CVE-2018-20396 describes credential discovery on NET&SYS MNG2120J 5.76.1006c and MNG6300 5.83.6305jrc2 through specific SNMP OID requests. The record provides no CWE, CVSS, patch status, or broader affected-product list.
Likely exposure
Exposure is credible only where the listed NET&SYS models and versions are deployed and SNMP is reachable by untrusted networks or users. The provided sources do not support applying this CVE to other products.
Exploitation context
The bundle supports remote credential discovery through SNMP. It does not show CISA KEV listing, active exploitation, public exploitation volume, or authentication requirements beyond SNMP reachability.
Researcher notes
Evidence is thin: the CVE description names two device versions and SNMP OIDs, while references point to a sensitive-OID list and related blog post. No official patch, CVSS, CWE, or exploitation confirmation is included.
Mitigation direction
- Inventory NET&SYS MNG2120J and MNG6300 devices and confirm firmware versions.
- Disable SNMP where it is not operationally required.
- Restrict SNMP access to trusted management hosts only.
- Rotate credentials that may have been exposed by affected devices.
- Check NET&SYS or maintainer guidance for firmware or configuration fixes.
- Monitor for unexpected SNMP queries to sensitive enterprise OIDs.
Validation and detection
- Confirm whether affected model and firmware versions exist in the environment.
- Review firewall rules for SNMP reachability from untrusted networks.
- Check device SNMP configuration and community or authentication settings.
- Review logs or telemetry for unusual SNMP access attempts.
- Validate remediation by confirming sensitive credential data is no longer exposed.
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.
Credential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-20396 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://github.com/ezelf/sensitivesOids/blob/master/oidpassswordleaks.csvCVE reference · x_refsource_MISC
- https://misteralfa-hack.blogspot.com/2018/12/stringbleed-y-ahora-que-passwords-leaks.htmlCVE 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.