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Tenda A18 CVE-2026-51934

| EUVDEUVD-2026-69391 CRITICAL
Classic Buffer Overflow (CWE-120)
2026-09-01 mitre GHSA-f36h-g6pc-35gw
9.8
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
9.8 CRITICAL

Unauthenticated, network-reachable buffer overflow in a router web handler yielding code execution as the service supports AV:N/AC:L/PR:N/UI:N and full C:H/I:H/A:H.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Metadata Corrected
Sep 02, 2026 - 16:40 vuln.today
tag: N A removed
Analysis Generated
Sep 02, 2026 - 16:31 vuln.today
CVSS changed
Sep 02, 2026 - 16:22 NVD
9.8 (CRITICAL)
CVE Published
Sep 01, 2026 - 00:00 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 01, 2026 - 00:00 cve.org
CRITICAL 9.8

DescriptionCVE.org

Buffer Overflow vulnerability in Shenzhen Jixiang Tengda Technology Co., Ltd. Tenda A18 v.15.13.07.09 allows a remote attacker to execute arbitrary code via the fromSetCmdlineRun function

AnalysisAI

Remote code execution in the Tenda A18 Wi-Fi router (firmware v15.13.07.09) arises from an unauthenticated buffer overflow in the fromSetCmdlineRun function, letting a remote attacker corrupt memory and run arbitrary code on the device. The CVSS 9.8 vector indicates network-reachable, no-authentication, no-interaction exploitation, and a public repository (github.com/momo8877847/Tenda-A18) appears to document the flaw, so publicly available exploit code likely exists. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden

Vulnerability AssessmentAI

Exploitation Exploitation requires network reachability to the Tenda A18's HTTP management service and the ability to send a request invoking the fromSetCmdlineRun function on firmware v15.13.07.09; per CVSS PR:N/UI:N no credentials or user interaction are needed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals point to a genuinely high-priority issue: the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H) describes trivially reachable, unauthenticated RCE, and the referenced GitHub repository suggests exploit details are public. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patched firmware version is identified in the available data, so no fix version can be cited; check Tenda's support site (http://tenda.com) for updated A18 firmware superseding v15.13.07.09 and apply it once published. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: audit all network infrastructure for Tenda A18 router deployments and identify devices running firmware v15.13.07.09 or earlier. …

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CVE-2026-51934 vulnerability details – vuln.today

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