CVE-2026-20797

Copeland XWEB and XWEB Pro Stack-based Buffer Overflow

Published Feb 27, 2026 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Copeland has provided a fix for the vulnerabilities and recommends users update the XWEB Pro to the latest version by going to their software update page https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate in the sections dedicated to the different XWEBPRO models page.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-121
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Copeland xweb 300d Pro
Copeland xweb 300d Pro Firmware
Copeland xweb 500b Pro
Copeland xweb 500b Pro Firmware
Copeland xweb 500d Pro
Copeland xweb 500d Pro Firmware
Weaknesses CWE-787
CPEs cpe:2.3:h:copeland:xweb_300d_pro:-:*:*:*:*:*:*:*
cpe:2.3:h:copeland:xweb_500b_pro:-:*:*:*:*:*:*:*
cpe:2.3:h:copeland:xweb_500d_pro:-:*:*:*:*:*:*:*
cpe:2.3:o:copeland:xweb_300d_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:copeland:xweb_500b_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:copeland:xweb_500d_pro_firmware:*:*:*:*:*:*:*:*
Vendors & Products Copeland xweb 300d Pro
Copeland xweb 300d Pro Firmware
Copeland xweb 500b Pro
Copeland xweb 500b Pro Firmware
Copeland xweb 500d Pro
Copeland xweb 500d Pro Firmware
Type Values Removed Values Added
First Time appeared Copeland
Copeland copeland Xweb 300d Pro
Copeland copeland Xweb 500b Pro
Copeland copeland Xweb 500d Pro
Vendors & Products Copeland
Copeland copeland Xweb 300d Pro
Copeland copeland Xweb 500b Pro
Copeland copeland Xweb 500d Pro
Type Values Removed Values Added
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.
Title Copeland XWEB and XWEB Pro Stack-based Buffer Overflow
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}