ZDI-CAN-25254: 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-CAN-25254?
The severity of ZDI-CAN-25254 is significant, as it allows remote attackers to execute arbitrary code.
How do I fix ZDI-CAN-25254?
To fix ZDI-CAN-25254, ensure that you have applied the latest security patches provided by Ashlar-Vellum for Cobalt.
What should users do to protect themselves from ZDI-CAN-25254?
Users should avoid visiting untrusted websites and opening unknown files to protect against ZDI-CAN-25254.
Is user interaction required to exploit ZDI-CAN-25254?
Yes, user interaction is required as the target must visit a malicious page or open a malicious file.
Which software is affected by ZDI-CAN-25254?
ZDI-CAN-25254 affects installations of Ashlar-Vellum Cobalt.