Service interruption via unchecked filename copy
Published Apr 6, 2026 · Updated Apr 6, 2026
Buffer overflow in UTT Aggressive 520W v3 firmware 1.7.7-180627 allows remote authenticated users to interrupt the router via FTP settings. The formFtpServerDirConfig handler passes the filename value to strcpy without checking its length, overflowing the destination buffer when Action is add. Administrative access to the router's adjacent-network web interface is required, and the demonstrated consequence is a device service interruption.
Summary
What happened
Buffer overflow in UTT Aggressive 520W v3 firmware 1.7.7-180627 allows remote authenticated users to interrupt the router via FTP settings. The formFtpServerDirConfig handler passes the filename value to strcpy without checking its length, overflowing the destination buffer when Action is add. Administrative access to the router's adjacent-network web interface is required, and the demonstrated consequence is a device service interruption.
The record
- CVE
- CVE-2026-31062
- Published
- Apr 6, 2026
- Updated
- Apr 6, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120, T1499.004
- Attack vector
- adjacent
- Privileges
- admin
Timeline
How it unfolded
- Apr 6, 2026CVE publishedPublication date reported by the CVE source.
- Apr 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- UTT Aggressive 520W formFtpServerDirConfig proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo