Quick answers
- Is CVE-2026-20797 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20797 being exploited in the wild.
- How severe is CVE-2026-20797?
- Medium severity, with a CVSS score of 4.3, published 27 February 2026.
- Which products and versions are affected?
- Copeland XWEB 300D PRO <=1.12.1; Copeland XWEB 500D PRO <=1.12.1; Copeland XWEB 500B PRO <=1.12.1.
- Is there a fix for CVE-2026-20797?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-20797 attacked?
- It is attacked over the network or from the adjacent network, in a network appliance.
- Am I affected by CVE-2026-20797?
- Check whether you run Copeland Xweb 300d Pro, Copeland Xweb 300d Pro Firmware, Copeland Xweb 500b Pro or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stack-based buffer overflow (CWE-121) exists within an API route of the Copeland XWEB Pro web interface. The vulnerability is caused by improper bounds checking when processing input, allowing an unauthenticated attacker to cause stack corruption. While some assessments suggest a high impact (CVSS 9.8), the primary reported impact from ICS-CERT is a program termination leading to a denial-of-service (DoS) condition. The attack can be executed over the network without user interaction. Copeland has released updates to address this and several other vulnerabilities in the XWEB Pro series.
Affected products
- Copeland XWEB 300D PRO <=1.12.1
- Copeland XWEB 500D PRO <=1.12.1
- Copeland XWEB 500B PRO <=1.12.1
Timeline
- 2026-02-26: advisory: CISA/ICS-CERT published advisory ICSA-26-057-10
- 2026-02-27: disclosed: CVE published to NVD