CVE-2026-36779Public exploitNetwork attack vector

Service interruption via unbounded CGI formatting

Published Jun 9, 2026 · Updated Jun 9, 2026

Stack-based buffer overflows in Tenda O3 Wireless Router 1.0.0.5(4180) allow remote attackers to crash or reboot it via HTTP requests. The fromVirtualSer CGI handler passes five request values to sprintf without length validation, overflowing the local_2d4 stack buffer. The published proof notes preceding authentication checks and requires wans.flag to equal 1; it does not establish unauthenticated reachability or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.40%
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 overflows in Tenda O3 Wireless Router 1.0.0.5(4180) allow remote attackers to crash or reboot it via HTTP requests. The fromVirtualSer CGI handler passes five request values to sprintf without length validation, overflowing the local_2d4 stack buffer. The published proof notes preceding authentication checks and requires wans.flag to equal 1; it does not establish unauthenticated reachability or code execution.

The record

CVE
CVE-2026-36779
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
network
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 vectornetwork
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)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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