CVE-2023-39943 Ashlar-Vellum Cobalt, Xenon, Argon, Lithium Out-of-bounds Write
An attacker can execute arbitrary code by tricking a user into opening a malicious XE file in Ashlar-Vellum CAD applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-39943?
CVE-2023-39943 is a high-severity memory corruption vulnerability in Ashlar Cobalt, published on 4 Feb 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In Ashlar-Vellum Cobalt versions prior to v12 SP2 Build (1204.200), the affected application lacks proper validation of user-supplied data when parsing XE files. This could lead to an out-of-bounds write. An attacker could leverage this vulnerability to execute arbitrary code in the context of the current process.
Weakness: CWE-787
Which versions are affected by CVE-2023-39943?
It affects 1 product.
Products include Ashlar Cobalt.
How do I fix CVE-2023-39943?
No fix has been published for CVE-2023-39943 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-39943 being exploited?
There is no known exploitation of CVE-2023-39943 in the wild and no public exploit code.
Other vulnerabilities in Ashlar Cobalt
- CVE-2023-40222 Ashlar-Vellum Cobalt, Xenon, Argon, Lithium Heap-based Buffer Overflow
- CVE-2025-11463 Ashlar-Vellum Cobalt XE File Parsing Integer Overflow Remote Code Execution Vulnerability
- CVE-2025-11464 Ashlar-Vellum Cobalt CO File Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability
- CVE-2025-11465 Ashlar-Vellum Cobalt CO File Parsing Use-After-Free Remote Code Execution Vulnerability
- CVE-2025-7977 Ashlar-Vellum Cobalt LI File Parsing Out-Of-Bounds Read Remote Code Execution Vulnerability
Sources
Also known as GHSA-c2c9-4ffg-xh97.