CVE-2026-74233
Unauthenticated UDP command injection in Zbtlink routers enabling remote root RCE
Is CVE-2026-74233 being exploited?
Not confirmed. CVE-2026-74233 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 2.6% probability of exploitation in the next 30 days.
How severe is CVE-2026-74233?
CVE-2026-74233 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-74233?
Not known from our data. No patch reference has been recorded for CVE-2026-74233, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-74233 affect?
CVE-2026-74233 affects Zbtlink WE1326 (fw 19.1101), Zbtlink WE357 (fw 19.1101), Zbtlink WE5926 / WE5926-WD (fw 19.1101), Zbtlink WE826-Q / WE826-T2 / WE826-WD (fw 19.1101), and 10 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74233?
Block UDP/9992, isolate affected devices, and apply vendor firmware updates when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote unauthenticated attacker can send a crafted UDP packet to UDP/9992 to execute arbitrary commands as root, enabling full system compromise and network pivoting.
Immediate action required
- affected19.1101
- affected19.1101
- affected19.1101
- affected19.1101
- affected19.1112
- affected19.1101
- affected19.1101
- affected20.0516
- affected19.1101
- affected19.1101
- affected19.1101
- affected19.1101
- affected19.051
- affected19.1101
- affected19.1101
- affected20.0622
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.