Stack-based Buffer Overflow in Tenda F453 by Tenda
CVE-2026-5021

8.7HIGH

Key Information:

Vendor

Tenda
Status
F453
Vendor
CVE Published:
29 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5021?

A stack-based buffer overflow vulnerability exists in the Tenda F453 version 1.0.0.3, specifically in the fromPPTPUserSetting function of the /goform/PPTPUserSetting component. This flaw can be exploited by manipulating the delno parameter, allowing remote attackers to execute arbitrary code. The potential for exploitation necessitates immediate attention to the affected systems to mitigate risks.

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Affected Version(s)

F453 1.0.0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-5021 - Proof of Concept

References

https://vuldb.com/vuln/353906
vdb-entrytechnical-description
https://vuldb.com/vuln/353906/cti
signaturepermissions-required
https://vuldb.com/submit/778415
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LtzHust2 (VulDB User)
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