CVE-2026-54211 is an out-of-bounds write vulnerability in the Webbox component of Tobit TeamDavid. Multiple form-data parameters processed by a server-client close handler are copied into insufficiently bounded buffers. An authenticated attacker can submit excessively long values for the affected parameters, including ATCTOLINE, ATCCCLINE, and numberCount, causing a stack buffer overflow. Affected releases include TeamDavid through Rollout 524; in Rollout 528, the affected functionality is disabled by default.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authenticated buffer-overflow vulnerability in multiple form-data parameters of TeamDavid Webbox's //serverClient_close.html endpoint. It can cause a server denial of service and may potentially permit remote code execution if stack protections can be bypassed.
A buffer overflow vulnerability in Tobit Laboratories AG TeamDavid Webbox endpoint //serverClient_close.html that can cause denial of service and could potentially lead to remote code execution and full server compromise.
A TeamDavid buffer overflow in /<user>/serverClient_close.html affecting multiple form parameters, allowing an authenticated attacker to crash the server.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.