Null Pointer Dereference in GNU cflow Lexer Component
CVE-2025-8735

4.8MEDIUM

Key Information:

Vendor

Gnu
Status
Cflow
Vendor
CVE Published:
8 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8735?

A problematic vulnerability has been identified in GNU cflow, specifically within the Lexer component's yylex function in the c.c file, leading to a null pointer dereference. This issue requires local access to exploit, meaning that an attacker must operate within the environment where the application is running. The vulnerability has been publicly disclosed and poses a significant risk unless properly mitigated.

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Affected Version(s)

cflow 1.0

cflow 1.1

cflow 1.2

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-2025-8735 - Proof of Concept

References

https://vuldb.com/?id.319231
vdb-entrytechnical-description
https://vuldb.com/?ctiid.319231
signaturepermissions-required
https://vuldb.com/?submit.622328
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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