Security readout for executives and security teams
Plain-English summary
CVE-2026-1547 is a command injection issue in TOTOLINK A7000R firmware 4.1cu.4154. A logged-in remote attacker could abuse a router CGI function to run commands through the plugin_name parameter. Public proof-of-concept material exists, but the source bundle does not show confirmed active exploitation.
Executive priority
Treat as a near-term network-edge risk if affected routers are in use. Public exploit availability raises urgency, but authentication requirements and lack of confirmed active exploitation keep this below critical. Prioritize inventory, exposure reduction, and vendor update checks.
Technical view
The vulnerability affects setUnloadUserData in /cgi-bin/cstecgi.cgi on TOTOLINK A7000R 4.1cu.4154. Input handling for plugin_name can allow command injection. The CVSS v2 vector is AV:N/AC:L/Au:S/C:P/I:P/A:P, indicating network access, low complexity, and required authentication.
Likely exposure
Exposure is most relevant for organizations using TOTOLINK A7000R routers running firmware 4.1cu.4154, especially where the management interface is reachable from untrusted networks. The provided data does not identify other affected models or versions.
Exploitation context
VulDB states the attack can be launched remotely and that exploit code is public. The CVSS vector indicates authentication is required. CISA KEV status is false in the provided bundle, and no cited source confirms active exploitation in the wild.
Researcher notes
Evidence is limited to CVE/VulDB records and a public PoC reference. Do not assume unauthenticated access, broader model impact, or an available patch from these sources. Validation should focus on asset identification, firmware version, management-plane exposure, and vendor remediation status.
Mitigation direction
- Identify any TOTOLINK A7000R devices and record firmware versions.
- Check TOTOLINK guidance for firmware updates or vendor remediation.
- Restrict router management interfaces to trusted administrative networks only.
- Disable remote administration if not required.
- Use strong, unique administrator credentials and review account access.
- Monitor for unusual administrative activity on affected routers.
Validation and detection
- Confirm whether A7000R firmware version is 4.1cu.4154.
- Verify management interfaces are not internet-exposed.
- Review logs for unexpected use of cstecgi.cgi administrative functions.
- Check vendor site and advisories for updated firmware guidance.
- Track VulDB and CVE records for status changes.
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-74: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-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 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-2026-1547 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
- Medium
- CVSS
- 6.5 (2.0)
- Known Exploited
- No
- Published
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P/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:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR86.4Primary CVE scoreVulnerability scoring details
Base CVSS 2.0 score
6.5MediumVector: AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
Source materials
- CVE List V5 sourceCVE List V5
- VDB-343231 | Totolink A7000R cstecgi.cgi setUnloadUserData command injectionCVE reference · vdb-entry, technical-description
- VDB-343231 | CTI Indicators (IOB, IOC, TTP, IOA)CVE reference · signature, permissions-required
- Submit #739713 | TOTOLINK A7000R V4.1cu.4154 Command InjectionCVE reference · third-party-advisory
- https://github.com/xyh4ck/iot_poc/blob/main/TOTOLINK/A7000R/01_RCE_setUnloadUserData_RCE.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 in Output Used by a Downstream Component ('Injection')
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('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 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.