CVE-2026-51846Public exploitNetwork attack vector

Unauthenticated code execution via wanSpeed stack overflow

Published Jun 19, 2026 · Updated Jun 19, 2026

Stack-based buffer overflow in Tenda AC7 15.03.06.44 allows remote attackers to execute arbitrary code through the wanSpeed parameter. The /goform/AdvSetMacMtuWan handler copies an oversized wanSpeed value into a fixed-size stack buffer without enforcing its length. An unauthenticated network request can corrupt control-flow data without user interaction, enabling complete router compromise.

CVSS severity9.8
Critical
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda AC7 15.03.06.44 allows remote attackers to execute arbitrary code through the wanSpeed parameter. The /goform/AdvSetMacMtuWan handler copies an oversized wanSpeed value into a fixed-size stack buffer without enforcing its length. An unauthenticated network request can corrupt control-flow data without user interaction, enabling complete router compromise.

The record

CVE
CVE-2026-51846
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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