CVE-2026-36773Public exploit

Device reboot via unbounded sprintf in ask_to_reboot

Published Jun 9, 2026 · Updated Jun 9, 2026

Stack-based buffer overflow in Tenda W3 Wireless Router 1.0.0.3(2204) allows remote attackers to reboot the device via crafted HTTP input. The ask_to_reboot CGI handler passes the user-controlled GO parameter to an unbounded sprintf call that concatenates it into a fixed-size stack buffer. The request must reach the adjacent-network management interface and take the bVar1 nonzero branch; exploitation crashes httpd or reboots the router.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
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 W3 Wireless Router 1.0.0.3(2204) allows remote attackers to reboot the device via crafted HTTP input. The ask_to_reboot CGI handler passes the user-controlled GO parameter to an unbounded sprintf call that concatenates it into a fixed-size stack buffer. The request must reach the adjacent-network management interface and take the bVar1 nonzero branch; exploitation crashes httpd or reboots the router.

The record

CVE
CVE-2026-36773
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499.004
Attack vector
adjacent
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 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 vectoradjacent
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

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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