TI-2025-01758 Aliases CVE-2025-2020 GHSA-47m3-gw83-4cqc

Out-of-bounds write in Ashlar-Vellum Cobalt

LOW 36CWE-787Published 2025-03-11 · Updated 2025-03-12

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00268 19th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Ashlar-Vellum	Cobalt	1204.91	—	No fix listed	CNA

Cobalt VendorAshlar-Vellum Affected 1204.91 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ashlar:cobalt:12.0.1204.91:::::::*	12.0.1204.91	Vulnerable	Ashlar-Vellum

cpe:2.3:a:ashlar:cobalt:12.0.1204.91:*:*:*:*:*:*:* Versions 12.0.1204.91 Vulnerable ·Ashlar-Vellum

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-2020
2026-10-03 Alias added: GHSA-47m3-gw83-4cqc

References

Advisory 1

ZDI-25-124

TI-2023-17127 Out-of-bounds write in Ashlar-Vellum Cobalt CVSS 3.1HIGH 8.8
TI-2025-40238 Heap-based Buffer Overflow in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
TI-2025-40241 Out-of-bounds read in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
TI-2025-40240 Out-of-bounds read in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
TI-2025-40239 Out-of-bounds write in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4
TI-2025-40237 Out-of-bounds Write in Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, Cobalt Share CVSS 4.0HIGH 8.4

See all 86 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences