CVE-2025-46269 Overview
CVE-2025-46269 is a heap-based buffer overflow [CWE-122] affecting Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, and Cobalt Share versions prior to 12.6.1204.204. The affected computer-aided design (CAD) applications fail to properly validate user-supplied data when parsing VC6 files. An attacker who convinces a user to open a crafted VC6 file can corrupt heap memory and execute arbitrary code in the context of the current process. The flaw was published to the National Vulnerability Database on August 18, 2025, and is documented in CISA ICS Advisory ICSA-25-224-01.
Critical Impact
Successful exploitation enables arbitrary code execution on engineering workstations that open malicious VC6 design files.
Affected Products
- Ashlar-Vellum Cobalt versions prior to 12.6.1204.204
- Ashlar-Vellum Xenon, Argon, and Lithium versions prior to 12.6.1204.204
- Ashlar-Vellum Cobalt Share versions prior to 12.6.1204.204
Discovery Timeline
- 2025-08-18 - CVE-2025-46269 published to NVD and CISA ICS Advisory ICSA-25-224-01 released
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-46269
Vulnerability Analysis
The vulnerability resides in the VC6 file parser shared across Ashlar-Vellum's CAD product family. When the application reads attacker-controlled fields from a VC6 file, it copies data into a fixed-size heap buffer without verifying that the supplied length matches the allocation size. The resulting heap-based buffer overflow [CWE-122] overwrites adjacent heap metadata and object pointers used by the parser.
An attacker who controls the overflowed memory can hijack control flow and run code with the privileges of the user running the CAD application. Because engineering workstations typically run as standard or power users with broad access to design repositories, exploitation can lead to intellectual property theft, lateral movement, or persistence within manufacturing and engineering environments.
Root Cause
The root cause is missing input validation [CWE-20] on length and offset fields within the VC6 file format. The parser trusts attacker-supplied size values and performs copy operations into heap buffers sized for expected, well-formed inputs. No bounds check exists before the write, allowing the overflow to corrupt adjacent heap structures.
Attack Vector
Exploitation requires user interaction. An attacker delivers a malicious VC6 file through email, file share, supplier exchange, or web download. When the victim opens the file in a vulnerable Cobalt, Xenon, Argon, Lithium, or Cobalt Share installation, the parser triggers the overflow. The attack is local, requires no privileges, but does require the victim to actively open the file.
No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the CISA ICS advisory for additional protocol-level detail.
Detection Methods for CVE-2025-46269
Indicators of Compromise
- Unexpected crashes or access violations in Ashlar-Vellum processes (Cobalt.exe, Xenon.exe, Argon.exe, Lithium.exe) immediately after opening a VC6 file
- VC6 files arriving from untrusted email senders, external suppliers, or unfamiliar file shares
- Ashlar-Vellum processes spawning command interpreters such as cmd.exe, powershell.exe, or rundll32.exe
- Outbound network connections from CAD application processes to unknown external hosts
Detection Strategies
- Hunt for child processes launched by Ashlar-Vellum CAD binaries, which should rarely create shell or scripting interpreters
- Monitor file-write operations by Ashlar-Vellum processes outside their working directories, especially into startup and persistence locations
- Inspect VC6 file attachments at the email gateway and apply structural validation where possible
- Correlate application crash telemetry with subsequent process or network anomalies on the same host
Monitoring Recommendations
- Enable Windows Error Reporting and crash dump collection on engineering workstations to capture exploitation artifacts
- Track endpoint telemetry for unusual memory allocation patterns and access violations within CAD application processes
- Log and review opens of VC6 files originating from removable media or downloads directories
How to Mitigate CVE-2025-46269
Immediate Actions Required
- Upgrade all Ashlar-Vellum Cobalt, Xenon, Argon, Lithium, and Cobalt Share installations to version 12.6.1204.204 or later
- Inventory engineering endpoints to identify vulnerable installs and prioritize systems that routinely exchange files with external parties
- Instruct CAD users to open VC6 files only from trusted, verified sources until patching is complete
Patch Information
Ashlar-Vellum addresses CVE-2025-46269 in version 12.6.1204.204 of the affected products. Apply the vendor-supplied update across all impacted installations. Coordinate patch deployment with engineering teams to minimize disruption to active design work, and reference CISA ICS Advisory ICSA-25-224-01 for vendor coordination details.
Workarounds
- Block or quarantine VC6 file attachments at the email gateway until patching is complete
- Restrict CAD workstation user accounts to least privilege so a successful exploit cannot escalate beyond the user context
- Segment engineering workstations from general corporate networks and limit outbound connectivity from CAD hosts
- Enable application allowlisting to prevent CAD processes from launching unauthorized executables or scripting hosts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
