CVE-2026-20797

EUVD-2026-8972
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
4.3 MEDIUM
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
copelandxweb_300d_pro_firmware
𝑥
≤ 1.12.1
copelandxweb_500d_pro_firmware
𝑥
≤ 1.12.1
copelandxweb_500b_pro_firmware
𝑥
≤ 1.12.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-10.json
https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate
https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-10