Buffer overflow in Ashlar Cobalt
CVE-2025-2020
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.
Vulnerability class: Buffer Overflow
EPSS: 0.003 (17.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Ashlar Cobalt — versions 12.0.1204.91
- Ashlar-vellum Cobalt — versions 1204.91
Weakness classification (CWE)
Public proof-of-concept exploits
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-2020?
- CVE-2025-2020 is a high-severity vulnerability in Ashlar Cobalt, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2025-03-11.
- How severe is CVE-2025-2020?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2025-2020 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.