Heap-Based Buffer Overflow in vstakhov libucl by Vstakhov
CVE-2025-6499

4.8MEDIUM

Key Information:

Vendor

Vstakhov

Status
Libucl
Vendor
CVE Published:
23 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6499?

A vulnerable implementation in the ucl_parse_multiline_string function of vstakhov's libucl up to version 0.9.2 allows for a heap-based buffer overflow. This vulnerability can be manipulated locally, potentially leading to unauthorized access or data manipulation. Publicly disclosed exploits may enable attackers to leverage this weakness.

Affected Version(s)

libucl 0.9.0

libucl 0.9.1

libucl 0.9.2

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-2025-6499 - Proof of Concept

References

https://vuldb.com/?id.313615
vdb-entrytechnical-description
https://vuldb.com/?ctiid.313615
signaturepermissions-required
https://vuldb.com/?submit.601011
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

Credit

JJLeo (VulDB User)
.
CVE-2025-6499 : Heap-Based Buffer Overflow in vstakhov libucl by Vstakhov