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CVE-2026-20797

Copeland XWEB and XWEB Pro Stack-based Buffer Overflow

Published: Feb 27, 2026Updated: May 10, 2026 Sources: CVE List NVD csafCWE-787
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.8%
Top 49.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Successful exploitation of these vulnerabilities could allow an attacker to bypass authentication, cause a denial-of-service condition, cause memory corruption, and execute arbitrary code.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-787CWE-121

Affected Products

xweb 300d pro firmwarecopeland
Embedded
ICS / OT / IoT / plc-scada-hmi
xweb 500d pro firmwarecopeland
Embedded
ICS / OT / IoT / plc-scada-hmi
xweb 500b pro firmwarecopeland
Embedded
ICS / OT / IoT / plc-scada-hmi
Copeland XWEB 300D PROCopeland
On-prem
ICS / OT / IoT / building-automation
Copeland XWEB 500D PROCopeland
On-prem
ICS / OT / IoT / building-automation
copelandcommercialICS / OT / IoTaka copeland xweb 300d pro, copeland xweb 500b pro, copeland xweb 500d pro
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-057-10.json
raw.githubusercontent.com
https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-10
cisa.gov
https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
cisa.gov
and 52 more references View all →

Timeline

Published
Feb 27, 2026
Last Updated
May 10, 2026

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