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PatchSiren cyber security CVE debrief

CVE-2026-7218 Totolink CVE debrief

CVE-2026-7218 is a buffer overflow vulnerability in Totolink N300RT 3.4.0-B20250430, impacting the function is_cmd_string_valid of the file /boafrm/formWsc in the component libapmib.so. The vulnerability allows for remote exploitation through manipulation of the localPin argument. Network administrators and security teams should be aware of this vulnerability and take immediate action to mitigate the risk. The vulnerability's remote exploitability and potential for code execution make it a high-priority issue for network administrators and security teams.

Vendor
Totolink
Product
N300RT
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-28
Original CVE updated
2026-07-24
Advisory published
2026-04-28
Advisory updated
2026-07-24

Who should care

Network administrators and security teams responsible for managing and securing Totolink N300RT devices should be aware of this vulnerability and take immediate action to mitigate the risk. This includes reviewing network configurations, monitoring for suspicious activity, and applying vendor patches or updates as available. Additionally, operators of affected platforms and those responsible for vulnerability management within impacted organizations should prioritize mitigation efforts.

Technical summary

The vulnerability is caused by a buffer overflow in the is_cmd_string_valid function of libapmib.so in Totolink N300RT 3.4.0-B20250430. An attacker can exploit this vulnerability by manipulating the localPin argument, potentially leading to remote code execution. This vulnerability affects Totolink N300RT devices running firmware version 3.4.0-B20250430. The attack surface is heightened because the exploitation can occur remotely, making immediate mitigation crucial.

Defensive priority

Highest Priority for Immediate Mitigation Due to Remote Exploitation Risk and Potential for Code Execution

Recommended defensive actions

  • Apply the vendor's official patch or update to a fixed version
  • Restrict access to the affected component
  • Monitor network traffic for suspicious activity
  • Implement additional security controls, such as intrusion detection and prevention systems
  • Review network configurations for exposure
  • Conduct a thorough asset inventory to identify affected systems
  • Establish a rollback plan for changes

Evidence notes

The CVE record was published on 2026-04-28T03:16:04.953Z and was last modified on 2026-07-24T08:10:00.150Z. The NVD entry is currently Deferred. Evidence is limited to public sources and may not reflect the full scope or impact of this vulnerability. Defenders should verify affected deployments and review vendor advisories for specific guidance. Limited source detail suggests exercising caution and verifying information through multiple channels.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-7218 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-7218

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-7218 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-7218

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.