ZDI-25-121: (0Day) Ashlar-Vellum Cobalt CO File Parsing Buffer Overflow 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 CO files. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a 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-2025-2017.
— ZDI
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch ZDI-25-121
Event History
Frequently Asked Questions
What is the severity of ZDI-25-121?
ZDI-25-121 has a high severity due to its potential for remote code execution.
How do I fix ZDI-25-121?
To fix ZDI-25-121, ensure you apply the latest security patches provided by Ashlar-Vellum for Cobalt.
What are the exploitation requirements for ZDI-25-121?
Exploitation of ZDI-25-121 requires user interaction, specifically visiting a malicious page or opening a malicious file.
What can attackers do with ZDI-25-121?
Attackers can execute arbitrary code on affected installations of Ashlar-Vellum Cobalt if ZDI-25-121 is exploited.
Which software is affected by ZDI-25-121?
ZDI-25-121 affects installations of Ashlar-Vellum Cobalt.