Copeland XWEB and XWEB Pro Stack-based Buffer Overflow
Summary
| CVE | CVE-2026-20797 |
|---|---|
| State | PUBLISHED |
| Assigner | icscert |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-02-27 02:16:18 UTC |
| Updated | 2026-05-10 14:16:46 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.000270000 probability, percentile 0.076900000 (date 2026-05-12)
Problem Types: CWE-787 | CWE-121 | WE-121 | CWE-121 CWE-121 Stack-based Buffer Overflow
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Secondary | 4.3 | MEDIUM | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| 3.1 | CNA | CVSS | 4.3 | MEDIUM | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Hardware | Copeland | Xweb 300d Pro | - | All | All | All |
| Operating System | Copeland | Xweb 300d Pro Firmware | All | All | All | All |
| Hardware | Copeland | Xweb 500b Pro | - | All | All | All |
| Operating System | Copeland | Xweb 500b Pro Firmware | All | All | All | All |
| Hardware | Copeland | Xweb 500d Pro | - | All | All | All |
| Operating System | Copeland | Xweb 500d Pro Firmware | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Copeland | Copeland XWEB 300D PRO | affected 1.12.1 custom | Not specified |
| CNA | Copeland | Copeland XWEB 500D PRO | affected 1.12.1 custom | Not specified |
| CNA | Copeland | Copeland XWEB 500B PRO | affected 1.12.1 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-05... | [email protected] | github.com | Third Party Advisory |
| www.cisa.gov/news-events/ics-advisories/icsa-26-057-10 | [email protected] | www.cisa.gov | Third Party Advisory, US Government Resource |
| webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate | [email protected] | webapps.copeland.com | Product |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Amir Zaltzman and Noam Moshe of Claroty Team82 reported this vulnerability to CISA. (en)
Additional Advisory Data
Solutions
CNA: 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.
CNA: Alternatively, a user logged into an XWEB Pro with internet access can update XWEB Pro directly from Copeland servers via the menu SYSTEM -- Updates | Network.