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CVE-2026-36779 Shenzhen Tenda Technology Co., Ltd CVE debrief

A high-severity vulnerability was discovered in the Shenzhen Tenda Technology Co., Ltd Tenda O3 Wireless Router v1.0.0.5(4180). The issue, tracked as CVE-2026-36779, is caused by multiple stack overflows in the fromVirtualSer function. Specifically, the vulnerability is triggered via the puVar2, puVar1, __s2, __s1_00, and puVar3 parameters. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request. The CVSS score for this vulnerability is 7.5, indicating a high severity level.

Vendor
Shenzhen Tenda Technology Co., Ltd
Product
Tenda O3 Wireless Router
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-10
Advisory published
2026-06-09
Advisory updated
2026-06-10

Who should care

Administrators and users of the affected Shenzhen Tenda Technology Co., Ltd Tenda O3 Wireless Router v1.0.0.5(4180) should prioritize patching this vulnerability to prevent potential Denial of Service (DoS) attacks.

Technical summary

CVE-2026-36779 is a high-severity vulnerability caused by multiple stack overflows in the fromVirtualSer function of the Shenzhen Tenda Technology Co., Ltd Tenda O3 Wireless Router v1.0.0.5(4180). The vulnerability is triggered via crafted HTTP requests and allows for Denial of Service (DoS) attacks. The CVSS score for this vulnerability is 7.5.

Defensive priority

High

Recommended defensive actions

  • Apply the necessary patches or updates provided by the vendor to fix the stack overflow vulnerabilities in the fromVirtualSer function of the Tenda O3 Wireless Router v1.0.0.5(4180).
  • Restrict access to the affected system and ensure that only authorized personnel can interact with it.
  • Monitor the system for suspicious activity and implement additional security measures if necessary.

Evidence notes

The CVE-2026-36779 vulnerability was discovered in the Shenzhen Tenda Technology Co., Ltd Tenda O3 Wireless Router v1.0.0.5(4180). The vulnerability is caused by multiple stack overflows in the fromVirtualSer function via the puVar2, puVar1, __s2, __s1_00, and puVar3 parameters. This allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request. For more information, refer to the [CVE-2026-36779 CVE record](resourceLinkAnnotations.cve-org) and [CVE-2026-36779 NVD detail](resourceLinkAnnotations.nvd).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-36779 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-36779

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-36779 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-36779

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.