Ashlar-Vellum Cobalt VC6 File Parser out-of-bounds write

Summaryinfo

A vulnerability has been found in Ashlar-Vellum Cobalt and classified as critical. This affects an unknown function of the component VC6 File Parser. This manipulation causes out-of-bounds write. This vulnerability is tracked as CVE-2025-2020. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical was found in Ashlar-Vellum Cobalt (the affected version unknown). Affected by this vulnerability is an unknown part of the component VC6 File Parser. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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. Was ZDI-CAN-25254.

The advisory is shared at zerodayinitiative.com. This vulnerability is known as CVE-2025-2020 since 03/05/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/08/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Ashlar-Vellum

Name

• Cobalt

License

• commercial

CPE 2.3info

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CPE 2.2info

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Entryinfo

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