CVE-2026-20797
CRITICALCVSS 9.8/10EPSS 0.78%
Last modified
CVE-2026-20797 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.78% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Copeland | Xweb 300d Pro Firmware | <= 1.12.1 |
| Copeland | Xweb 500d Pro Firmware | <= 1.12.1 |
| Copeland | Xweb 500b Pro Firmware | <= 1.12.1 |
References
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-10Third Party Advisory, US Government Resource
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-20797?
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.
How severe is CVE-2026-20797?
CVE-2026-20797 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.78% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20797?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2026-20797?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST