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
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to the device's gohead HTTP management interface and the ability to send a request that reaches the sub_487330/FUN_00487330 code path; per the CVSS vector (AV:N/AC:L/PR:N/UI:N) no authentication or user interaction is needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are consistent but modest: the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, A:H, C:N/I:N) describes an easy, unauthenticated, network-reachable crash with no confidentiality or integrity impact, yielding 7.5 (High) driven purely by availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to the nv518G management interface sends a crafted oversized HTTP request that reaches the sub_487330 handler in the gohead daemon, overflowing an unchecked buffer and crashing the service. This knocks the gateway offline, disrupting connectivity for everyone behind it; a public GitHub write-up documenting the vulnerable function could aid reproduction, though no confirmed weaponized exploit is listed. |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all UTT nv518G devices running firmware nv518GV3v3.2.7-210919-161313 or similar versions; restrict network access to the management interface (gohead component) via firewall rules to trusted administrative networks only. …
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View allSame technique Denial Of Service
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External POC / Exploit Code
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