UTT nv518G CVE-2026-52188
MEDIUMSeverity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Adjacent vector because management interface is LAN-bound; PR:N as no credentials required; A:H for device crash; no C or I impact confirmed.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
Buffer Overflow vulnerability in UTT nv518G nv518GV3v3.2.7-210919-161313 allows a remote attacker to cause a denial of service via the gohead//sub_497498 component
AnalysisAI
Denial-of-service via buffer overflow in UTT nv518G firmware (nv518GV3v3.2.7-210919-161313) allows an adjacent-network attacker to crash the device by sending a crafted request to the GoAhead embedded webserver's sub_497498 handler. The vulnerability is rooted in CWE-119 (improper bounds restriction) and requires no authentication, meaning any host on the same LAN segment can trigger device unavailability. A GitHub-hosted CVE report with technical detail exists, indicating publicly available exploit code, though EPSS at 0.22% (13th percentile) reflects low observed exploitation probability - consistent with the limited geographic and market footprint of UTT devices.
Technical ContextAI
The affected component is sub_497498, a function within the GoAhead embedded HTTP server ('gohead') on the UTT nv518G router, a SOHO/SMB gateway appliance manufactured by Universal Time Technology (UTT), primarily marketed in China. GoAhead is a widely embedded micro-webserver used in IoT and networking devices for their management interface. CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) indicates that the parser or handler for a specific HTTP route does not validate input length before copying it into a fixed-size buffer, permitting an overwrite of adjacent memory. On embedded MIPS or ARM-class hardware without strong ASLR or stack canaries, such overflows reliably cause process crashes and device reboots rather than controlled code execution, producing the observed availability-only impact. The CPE provided in NVD (cpe:2.3:a:n/a:n/a) is placeholder/incomplete, so affected version is confirmed solely by the firmware string nv518GV3v3.2.7-210919-161313 cited in the CVE description.
RemediationAI
Upgrade the UTT nv518G firmware to the latest available version via the UTT download center at https://utt.com.cn/downloadcenter.php?filetypeid=3&model=518G&lang=zhcn; at time of analysis no specific patched firmware version has been independently confirmed by NVD or a formal vendor advisory, so 'Patch available per vendor advisory' applies with the caveat that version confirmation should be sought directly from UTT support. As a compensating control, restrict access to the device's GoAhead web management interface by binding it to the management VLAN only and applying ACLs to prevent untrusted LAN hosts from reaching the management port - note this reduces operational convenience. If the web management interface is not required for daily operations, disable it at the firmware level if the option exists. Rate-limiting or firewall rules blocking HTTP traffic to the router's management IP from general LAN hosts provide an additional layer. Organizations should monitor device uptime and reboot frequency as an indicator of potential exploitation attempts.
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Same weakness CWE-119 – Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today