Security readout for executives and security teams
Plain-English summary
CVE-2018-20391 describes TEKNOTEL CBW700N devices exposing credentials through specific SNMP object requests. Someone who can query SNMP on an affected device may be able to retrieve stored passwords. The public record does not provide CVSS, confirmed CPEs, vendor fix details, or exploitation evidence.
Executive priority
Treat this as an exposure-control issue, especially for edge or customer-premises equipment. Prioritize finding affected devices and restricting SNMP reachability. Escalate urgency if any affected device is reachable from the Internet or untrusted partner networks.
Technical view
The CVE reports credential discovery via SNMP requests to iso.3.6.1.4.1.4491.2.4.1.1.6.1.1.0 and iso.3.6.1.4.1.4491.2.4.1.1.6.1.2.0 on TEKNOTEL CBW700N 81.447.392110.729.024 devices. No CWE, CVSS vector, or remediation advisory is included in the provided sources.
Likely exposure
Exposure is most likely where TEKNOTEL CBW700N devices run the named 81.447.392110.729.024 version and accept SNMP queries from untrusted networks. Risk is lower where SNMP is disabled or restricted to trusted management hosts.
Exploitation context
The provided sources support remote credential discovery through SNMP queries, but do not show confirmed active exploitation. The CVE is not listed as KEV in the bundle, and exploit maturity is not established from the supplied evidence.
Researcher notes
Evidence is sparse: the CVE names the device, firmware string, and two SNMP OIDs associated with credential discovery, but lacks CVSS, CWE, CPE, vendor advisory, and patch status. Avoid assuming broader TEKNOTEL impact without confirming device and firmware behavior.
Mitigation direction
- Identify whether TEKNOTEL CBW700N devices exist in managed networks.
- Restrict SNMP access to trusted management networks only.
- Disable SNMP where it is not operationally required.
- Rotate credentials on exposed or suspected affected devices.
- Check vendor or ISP guidance for firmware updates or replacement options.
Validation and detection
- Inventory devices matching TEKNOTEL CBW700N and the named firmware version.
- Confirm SNMP is disabled or limited to approved management hosts.
- Review firewall rules for inbound SNMP exposure from untrusted networks.
- Check device configuration for default or weak SNMP community settings.
- Document whether vendor remediation guidance exists for deployed units.
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-2018-20391 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.