CVE-2026-51845Public exploitNetwork attack vector

Remote code execution via unchecked mac copy

Published Jun 19, 2026 · Updated Jun 19, 2026

Stack buffer overflow in AdvSetMacMtuWan in Tenda AC7 15.03.06.44 allows remote attackers to execute code through the mac parameter. check_param_changed copies the user-controlled mac value into a fixed-size stack buffer with strcpy and performs no destination-size check. The published request includes a password cookie, although the official CVSS assessment requires no privileges; successful exploitation permits code execution or a service crash.

CVSS severity9.8
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in AdvSetMacMtuWan in Tenda AC7 15.03.06.44 allows remote attackers to execute code through the mac parameter. check_param_changed copies the user-controlled mac value into a fixed-size stack buffer with strcpy and performs no destination-size check. The published request includes a password cookie, although the official CVSS assessment requires no privileges; successful exploitation permits code execution or a service crash.

The record

CVE
CVE-2026-51845
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121
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

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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