Stack-Based Buffer Overflow in Tenda FH1202 Router by Tenda
CVE-2026-3809

8.7HIGH

Key Information:

Vendor

Tenda
Status
Fh1202
Vendor
CVE Published:
9 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3809?

A stack-based buffer overflow vulnerability exists in the Tenda FH1202's fromNatStaticSetting function. By manipulating the argument page within the /goform/NatSaticSetting file, an attacker can exploit this flaw remotely, potentially compromising the device's integrity. This vulnerability poses significant risks as it allows unauthorized access and could lead to remote exploitation. Users of the affected firmware version should take immediate action to mitigate risks.

Affected Version(s)

FH1202 1.2.0.14(408)

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-2026-3809 - Proof of Concept

References

https://vuldb.com/?id.349775
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349775
signaturepermissions-required
https://vuldb.com/?submit.769039
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

m202572177 (VulDB User)
.