Medium 4.3Published Feb 26, 2026

CVE-2026-20797Copeland XWEB and XWEB Pro Stack-based Buffer Overflow

Updated under an hour ago (Oct 26, 2026, 8:50 PM ET)

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It affects Copeland XWEB 300D PRO and 5 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Copeland XWEB 300D PRO

Exploited in the last 30 days

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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-121
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: icscert
NVD analysis: Modified
Record last updated: May 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Copeland Copeland XWEB 300D PRO copeland:xweb_300d_pro (from the name)	through 1.12.1	CNA record
Copeland Copeland XWEB 500D PRO copeland:xweb_500d_pro (from the name)	through 1.12.1	CNA record
Copeland Copeland XWEB 500B PRO copeland:xweb_500b_pro (from the name)	through 1.12.1	CNA record
copeland xweb_300d_pro_firmware copeland:xweb_300d_pro_firmware	through 1.12.1	NVD
copeland xweb_500d_pro_firmware copeland:xweb_500d_pro_firmware	through 1.12.1	NVD
copeland xweb_500b_pro_firmware copeland:xweb_500b_pro_firmware	through 1.12.1	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.