UTT nv518G CVE-2026-52189
HIGHSeverity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Unauthenticated network-reachable crash via HTTP management interface (AV:N/AC:L/PR:N/UI:N); impact is availability-only denial of service with no confidentiality or integrity effect.
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_487330 component
AnalysisAI
Denial of service in the UTT nv518G security gateway/router (firmware nv518GV3v3.2.7-210919-161313) lets remote attackers crash the device by triggering a buffer overflow in the gohead web-management component's sub_487330 (FUN_00487330) function. The CVSS vector indicates unauthenticated network exploitation with availability-only impact, EPSS is low at 0.22% (13th percentile), and no active exploitation is recorded, though a public technical write-up of the flawed function exists on GitHub.
Technical ContextAI
The affected component is 'gohead', UTT's embedded HTTP management server (the name suggests a GoAhead-derived lightweight web server commonly used in networking appliances). The vulnerable routine sub_487330/FUN_00487330 is a native function within this daemon, and the root cause is classified as CWE-120 (Classic Buffer Copy without Checking Size of Input) - attacker-controlled input is copied into a fixed-size stack or global buffer without bounds validation, corrupting adjacent memory and crashing the process. The CPE string provided (cpe:2.3:a:n/a:n/a:*) is a placeholder with no meaningful vendor/product data, so the affected product must be taken from the description rather than structured NVD CPE.
RemediationAI
No vendor-released patched firmware version is identified at time of analysis; check the UTT download center (https://utt.com.cn/downloadcenter.php?filetypeid=3&model=518G&lang=zhcn) for firmware later than nv518GV3v3.2.7-210919-161313 and apply it once published. As compensating controls, restrict access to the gohead web-management interface to trusted management VLANs or hosts via ACLs and never expose it to the WAN/Internet (trade-off: remote administration must then use a VPN or jump host); place the device behind a firewall that blocks unsolicited inbound connections to its HTTP management port; and monitor for unexpected reboots or gateway unavailability as an indicator of exploitation attempts. Because impact is availability-only, prioritize network exposure reduction over emergency downtime.
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Same weakness CWE-120 – Classic Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today