CVE-2026-20797

MEDIUM 4.3

Copeland XWEB and XWEB Pro Stack-based Buffer Overflow

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	copeland
Product	copeland xweb 300d pro
Published	Feb 27, 2026
Last Updated	Mar 2, 2026

Stay Ahead of the Next One

Get instant alerts for copeland copeland xweb 300d pro

Be the first to know when new medium vulnerabilities affecting copeland copeland xweb 300d pro are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

Copeland / Copeland XWEB 300D PRO

0 ≤ 1.12.1

Copeland / Copeland XWEB 500D PRO

0 ≤ 1.12.1

Copeland / Copeland XWEB 500B PRO

0 ≤ 1.12.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

webapps.copeland.com: https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate cisa.gov: https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-10 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-10.json

Credits

Amir Zaltzman and Noam Moshe of Claroty Team82 reported this vulnerability to CISA.