CVE-2026-19509Network attack vector

Authenticated DoS via unchecked ssid_number forwarding

Published Aug 19, 2026 · Updated Aug 19, 2026

Improper input validation in RDK-B WebUI rdkb-2025q4-kirkstone allows remote authenticated users to interrupt service via ssid_number. In ajaxSet_wireless_network_configuration.jst, the ssid_number parameter is passed directly to a native C handler and then to RBus without validation, which segfaults the rtrouted message router. Reachability requires valid WebUI authentication, and the observed effect is a watchdog-driven restart of rtrouted rather than published evidence of code execution or broader device compromise.

CVSS severityUnavailable
Unscored
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in RDK-B WebUI rdkb-2025q4-kirkstone allows remote authenticated users to interrupt service via ssid_number. In ajaxSet_wireless_network_configuration.jst, the ssid_number parameter is passed directly to a native C handler and then to RBus without validation, which segfaults the rtrouted message router. Reachability requires valid WebUI authentication, and the observed effect is a watchdog-driven restart of rtrouted rather than published evidence of code execution or broader device compromise.

The record

CVE
CVE-2026-19509
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
RDK Management LLC
Product
RDK-B WebUI
Classifications
CWE-20, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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.

  1. Affected versionversion=rdkb-2025q4-kirkstone

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RDK Management LLC · RDK-B WebUIversion=rdkb-2025q4-kirkstone

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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