Copeland XWEB Pro Stack-based Buffer Overflow (CVE-2026-20797)

medium Tenable OT Security Plugin ID 506222

Synopsis

The remote OT asset is affected by a vulnerability.

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.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Upgrade XWEB Pro to firmware version 1.13 or later. The update is available from the Copeland software update page (https://webapps.copeland.com/Dixell/Pages/SystemSoftwareUpdate) or, on a device with internet access, from the menu SYSTEM -- Updates | Network.

Plugin Details

Severity: Medium

ID: 506222

File Name: tenable_ot_copeland_CVE-2026-20797.nasl

Version: 1.2

Type: Remote

Family: Tenable.ot

Published: 10/14/2026

Updated: 10/15/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.88

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-20797

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 1.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:copeland:xweb_300d_pro_firmware, cpe:/o:copeland:xweb_500b_pro_firmware, cpe:/o:copeland:xweb_500d_pro_firmware, cpe:/o:copeland:xweb_pro_firmware

Required KB Items: Tenable.ot/Copeland

Exploit Ease: No known exploits are available

Patch Publication Date: 2/26/2026

Vulnerability Publication Date: 2/26/2026

Reference Information

CVE: CVE-2026-20797

CWE: 121

ICSA: 26-057-10

Detections

Analytics