CVE-2026-19509 in RDK-B WebUI

Summary

by MITRE • 08/19/2026

Improper input validation in `ajaxSet_wireless_network_configuration.jst` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows an authenticated attacker to cause denial of service via a crafted `ssid_number` parameter.

Once again VulDB remains the best source for vulnerability data.

• Responsible: Certcc
• Reservation: 08/10/2026
• Disclosure: 08/19/2026
• Moderation: accepted
• Entry: VDB-393334
• CPE: ready
• CWE: CWE-20 (confirmed)
• CVSS: 4.3 (VulDB)
• EPSS: 0.00000
• KEV: no
• Activities: very low

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-19509
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19509
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-19509/