CVE-2026-54211
Authenticated buffer overflow in TeamDavid Webbox //serverClient_close.html causing DoS and potential RCE.
Is CVE-2026-54211 being exploited?
Not confirmed. CVE-2026-54211 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 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-54211?
CVE-2026-54211 is rated Critical with a CVSS score of 9.5. 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-2026-54211?
Not known from our data. No patch reference has been recorded for CVE-2026-54211, 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-2026-54211 affect?
CVE-2026-54211 affects Tobit TeamDavid Webbox (<= Rollout 524), TeamDavid //serverClient_close.html endpoint. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-54211?
Block external access, disable endpoint, restrict to trusted networks, monitor logs, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can send oversized form fields to crash the server (DoS); may enable remote code execution and full server compromise if memory/state allows.
Immediate action required
- affected< Rollout 528
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.