CVE-2026-20797 Copeland XWEB and XWEB Pro Stack-based Buffer Overflow
Unauthenticated attackers can cause a stack-based buffer overflow in Copeland XWEB Pro, leading to program termination and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20797?
CVE-2026-20797 is a medium-severity memory corruption vulnerability in Copeland XWEB 300D PRO, published on 27 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A stack based buffer overflow exists in an API route of XWEB Pro version 1.12.1 and prior, enabling unauthenticated attackers to cause stack corruption and a termination of the program.
Which versions are affected by CVE-2026-20797?
It affects 3 products.
Products include Copeland Xweb 300d Pro Firmware, Copeland Xweb 500b Pro Firmware, Copeland Xweb 500d Pro Firmware.
How do I fix CVE-2026-20797?
No fix has been published for CVE-2026-20797 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-2026-20797 being exploited?
There is no known exploitation of CVE-2026-20797 in the wild and no public exploit code.
Other vulnerabilities in Copeland XWEB 300D PRO
- CVE-2026-21718 Copeland XWEB and XWEB Pro Use of a Broken or Risky Cryptographic Algorithm
- CVE-2026-24663 Copeland XWEB and XWEB Pro OS Command Injection
- CVE-2026-25085 Copeland XWEB and XWEB Pro Unexpected Status Code or Return Value
- CVE-2026-20742 Copeland XWEB and XWEB Pro OS Command Injection
- CVE-2026-20764 Copeland XWEB and XWEB Pro OS Command Injection
Sources
Also known as GHSA-rgf4-44r9-4r27.