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CVE-2025-62840 is an information disclosure vulnerability in QNAP HBS 3 Hybrid Backup Sync caused by generation of error messages containing sensitive information. The flaw has been described in connection with handling of the rr2s.kwargs parameter by the server_handlers.pyc endpoint, where malformed or attacker-controlled input can trigger error output that exposes application data. On affected installations, a network-adjacent attacker on the local network can exploit the issue to read sensitive information from the application. Public reporting also indicates the vulnerable condition was demonstrated against QNAP TS-453E devices as part of a Pwn2Own exploit chain.
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No public exploit code observed for this vulnerability.
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A QNAP vulnerability affecting HBS 3 Hybrid Backup Sync, referenced as one of the zero-day vulnerabilities patched after Pwn2Own Ireland 2025.
A zero-day vulnerability in QNAP HBS 3 Hybrid Backup Sync software, demonstrated at Pwn2Own 2025 and patched by QNAP.
A zero-day vulnerability in QNAP's HBS 3 Hybrid Backup Sync, exploited during Pwn2Own Ireland 2025.
One of multiple vulnerabilities demonstrated at Pwn2Own Ireland 2025 affecting QNAP routers and NAS devices; patched by QNAP (via HBS 3 Hybrid Backup Sync update).
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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.