#VU105704 Integer overflow in Cobalt - CVE-2025-2021

Vulnerability identifier: #VU105704

Vulnerability risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-2021

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cobalt
Client/Desktop applications / Virtualization software

Vendor: Ashlar-Vellum

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow when parsing XE files. A remote attacker can trick the victim into opening a specially crafted file, trigger an integer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cobalt: All versions

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External links
https://www.zerodayinitiative.com/advisories/ZDI-25-125/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.