How severe is CVE-2026-20797?

CVE-2026-20797 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-20797 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20797?

CVE-2026-20797 primarily affects Copeland Xweb 300d Pro Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20797?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-20797 have an EU (EUVD) identifier?

Yes. CVE-2026-20797 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8972.

When was CVE-2026-20797 published?

CVE-2026-20797 was published on 2026-02-27 and last updated on 2026-06-17.

CVE-2026-20797

CVE-2026-20797 is a medium-severity vulnerability in Copeland Xweb 300d Pro Firmware with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8972
Weakness: CWE-787
Affected product: Copeland Xweb 300d Pro Firmware
Published: 2026-02-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-20797?: 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.
How severe is CVE-2026-20797?: CVE-2026-20797 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-20797 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20797?: CVE-2026-20797 primarily affects Copeland Xweb 300d Pro Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20797?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20797 have an EU (EUVD) identifier?: Yes. CVE-2026-20797 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8972.
When was CVE-2026-20797 published?: CVE-2026-20797 was published on 2026-02-27 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:copeland:xweb_300d_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:copeland:xweb_500d_pro_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:copeland:xweb_500b_pro_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Copeland Xweb 300d Pro Firmware

CVE-2026-21718 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, enabling any attackers to…
CVE-2026-24663 — Critical (CVSS 9.0): An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an unauthenticated…
CVE-2026-25085 — High (CVSS 8.6): A vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, in which an unexpected return value from the…
CVE-2026-3037 — High (CVSS 8.0): An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker…
CVE-2026-25721 — High (CVSS 8.0): An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker…
CVE-2026-25196 — High (CVSS 8.0): An OS command injection vulnerability exists in XWEB Pro version 1.12.1 and prior, enabling an authenticated attacker…

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