CVE-2025-2020

(0Day) Ashlar-Vellum Cobalt VC6 File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

CVE ID CVE-2025-2020

CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

AFFECTED VENDORS Ashlar-Vellum

AFFECTED PRODUCTS Cobalt

VULNERABILITY DETAILS

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.

ADDITIONAL DETAILS

09/26/24 – ZDI reported the vulnerability to the vendor

09/26/24 – the vendor acknowledged the receipt of the report

01/13/25 - ZDI asked for updates

01/17/25 – ZDI notified the vendor of the intention to publish the case as a  0-day advisory

DISCLOSURE TIMELINE

2024-09-26 - Vulnerability reported to vendor

2025-03-10 - Coordinated public release of advisory

2025-03-10 - Advisory Updated

CREDIT Rocco Calvi (@TecR0c) with TecSecurity