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Vulnerabilities

Vulnerability · 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 terminati…

Published Feb 27, 2026 · catalog updated Jun 17, 2026 · xweb 300d pro firmware

Check if you run it

No confirmed exploitation is on record for CVE-2026-20797. EPSS is 0.77%. Act only if a listed version of xweb 300d pro firmware is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.77%
Remediation
Advisory link
Affected products
cpe copeland/xweb 300d pro firmware · cpe copeland/xweb 500b pro firmware · cpe copeland/xweb 500d pro firmware

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe copeland/xweb 300d pro firmwareversion unspecified
  • cpe copeland/xweb 500b pro firmwareversion unspecified
  • cpe copeland/xweb 500d pro firmwareversion unspecified

How to fix CVE-2026-20797

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20797. EPSS is 0.77%. Act only if a listed version of xweb 300d pro firmware is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow; CWE-787: Out-of-bounds Write. EPSS 0.77%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 27, 2026 · NIST NVD

    Detected

    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.

  2. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-20797

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20797

    30-day exploitation probability 0.8%

    first.org
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.