Appliance termination via API stack overwrite
Published Feb 27, 2026 · Updated Feb 27, 2026
Stack-based buffer overflow in Copeland XWEB PRO 1.12.1 and earlier allows remote attackers to terminate the appliance via an API request. An undisclosed API route writes attacker-controlled data past a stack buffer, corrupting the process stack; Copeland has not identified the route or input field. No authentication or user interaction is required, but the attacker must share an adjacent network, and the reported consequence is program termination.
Summary
What happened
Stack-based buffer overflow in Copeland XWEB PRO 1.12.1 and earlier allows remote attackers to terminate the appliance via an API request. An undisclosed API route writes attacker-controlled data past a stack buffer, corrupting the process stack; Copeland has not identified the route or input field. No authentication or user interaction is required, but the attacker must share an adjacent network, and the reported consequence is program termination.
The record
- CVE
- CVE-2026-20797
- Published
- Feb 27, 2026
- Updated
- Feb 27, 2026
- Vendor
- Copeland LP
- Product
- XWEB 300D PRO
- Classifications
- CWE-121, CWE-787, T1499, T0814
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 27, 2026CVE publishedPublication date reported by the CVE source.
- Feb 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=1.12.1
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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