Security readout for executives and security teams
Plain-English summary
CVE-2026-3301 is a critical remote command injection issue in the Totolink N300RH router web management interface. A public proof of concept is referenced, increasing urgency. Sources do not show confirmed active exploitation or a named vendor patch. Organizations using this model and firmware should treat exposed management interfaces as high-risk.
Executive priority
Prioritize within normal emergency vulnerability response if affected devices are internet-facing. The combination of critical impact, remote reachability, and public proof of concept creates high business risk, even without confirmed active exploitation.
Technical view
The flaw affects Totolink N300RH firmware 6.1c.1353_B20190305. The vulnerable component is /cgi-bin/cstecgi.cgi, specifically setWebWlanIdx handling of the webWlanIdx argument. The reported impact is OS command injection, remotely reachable with no authentication under the CVSS v2 vector provided by VulDB/CVE data.
Likely exposure
Exposure is most likely where Totolink N300RH devices run firmware 6.1c.1353_B20190305 and the web management interface is reachable from untrusted networks. Internet-facing administration would materially increase risk. The sources do not confirm other Totolink models or firmware versions.
Exploitation context
The source bundle states the exploit has been released publicly and includes a GitHub proof-of-concept reference. The CVE is not listed as KEV in the provided data, and no cited source confirms active exploitation in the wild.
Researcher notes
Evidence is based on CVE/VulDB records and a public PoC reference. Patch status, vendor acknowledgement, and broader version impact are not established in the provided sources. Avoid assuming other models are affected without separate evidence.
Mitigation direction
- Identify Totolink N300RH devices and confirm firmware version.
- Remove web management exposure from the internet and untrusted networks.
- Restrict administrative access to trusted management networks only.
- Check Totolink advisories and firmware downloads for official remediation.
- Replace or isolate devices if no supported fix is available.
Validation and detection
- Inventory routers by model, firmware, and management exposure.
- Verify whether firmware matches 6.1c.1353_B20190305.
- Review perimeter scans for exposed Totolink web administration.
- Check logs for unusual web management requests to cstecgi.cgi.
- Track CVE, VulDB, and Totolink pages for updates.
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.
CWE-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-3301 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
- Critical
- CVSS
- 10 (2.0)
- Known Exploited
- No
- Published
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR1010Primary CVE scoreVulnerability scoring details
Base CVSS 2.0 score
10CriticalVector: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Source materials
- CVE List V5 sourceCVE List V5
- VDB-348052 | Totolink N300RH Web Management cstecgi.cgi setWebWlanIdx os command injectionCVE reference · vdb-entry, technical-description
- VDB-348052 | CTI Indicators (IOB, IOC, TTP, IOA)CVE reference · signature, permissions-required
- Submit #761297 | TOTOLINK N300RH_V4 V6.1c.1353_B20190305 Command InjectionCVE reference · third-party-advisory
- https://github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/N300RHv4/01_setWebWlanIdx_RCE/README.mdCVE reference · exploit
- https://www.totolink.net/CVE reference · product
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.
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.