CVE-2026-20797

Copeland XWEB and XWEB Pro Stack-based Buffer Overflow

State: Published
Severity: 4.3 Medium
Published: Feb 27, 2026
Updated: May 10, 2026
Reserved: Feb 5, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	icscert

Weaknesses

CWE-121 Stack-based Buffer Overflow

Affected Products

Product	Versions
Copeland XWEB 300D PROCopeland	1.12.1 and earlierAffected
Copeland XWEB 500D PROCopeland	1.12.1 and earlierAffected
Copeland XWEB 500B PROCopeland	1.12.1 and earlierAffected

References

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

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