ZDI-25-124: (0Day) Ashlar-Vellum Cobalt VC6 File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of VC6 files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.
Other sources
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2025-2020.
— ZDI
Affected Software
Event History
Frequently Asked Questions
What is the severity of ZDI-25-124?
The ZDI-25-124 vulnerability has been assigned a high severity rating due to its potential for remote code execution.
How do I fix ZDI-25-124?
To fix ZDI-25-124, update Ashlar-Vellum Cobalt to the latest version that resolves this vulnerability.
What types of attacks can be executed using ZDI-25-124?
ZDI-25-124 allows attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt.
Who is affected by ZDI-25-124?
Users of Ashlar-Vellum Cobalt are at risk due to the ZDI-25-124 vulnerability.
What is required for exploitation of ZDI-25-124?
Exploitation of ZDI-25-124 requires user interaction, such as visiting a malicious webpage or opening a harmful file.