Buffer overflow in Copeland Xweb 300d Pro
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.008 (55.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000
Affected products
Weakness classification (CWE)
References
- webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate (Product)
- www.cisa.gov/news-events/ics-advisories/icsa-26-057-10 (US Government Resource, Third Party Advisory)
- github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-10.js… (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-20797?
- CVE-2026-20797 is a medium-severity vulnerability in Copeland Xweb 300d Pro, classified under Out-of-bounds Write. CVSS score: 4.3/10. Published 2026-02-27.
- How severe is CVE-2026-20797?
- Medium severity. CVSS v3 base score is 4.3 out of 10.