CVE-2026-36803Public exploitNetwork attack vector

Unauthenticated service crash via unbounded sprintf

Published Jun 9, 2026 · Updated Jun 9, 2026

A buffer overflow in Tenda PW201A 1.0.5 qossetting allows remote attackers to crash the HTTP service via a crafted HTTP request. The handler reads the page parameter with websGetVar and passes it without a length limit to sprintf into the fixed-size acStack_120 buffer. No authentication or user interaction is required; an oversized page value can crash the process or destabilize the device, with no reported data access or modification.

CVSS severity7.5
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in Tenda PW201A 1.0.5 qossetting allows remote attackers to crash the HTTP service via a crafted HTTP request. The handler reads the page parameter with websGetVar and passes it without a length limit to sprintf into the fixed-size acStack_120 buffer. No authentication or user interaction is required; an oversized page value can crash the process or destabilize the device, with no reported data access or modification.

The record

CVE
CVE-2026-36803
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-120Buffer Copy without Checking Size of Input ('Classic 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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