EUVD-2026-40865
GHSA-p6vq-whcp-3j3j
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Unauthenticated network-reachable web handler triggered by a single crafted request (AV:N/AC:L/PR:N/UI:N); impact is a crash only, so C:N/I:N and A:H.
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_472f08 component
AnalysisAI
Denial of service in the UTT nv518G gateway/router (firmware nv518GV3 v3.2.7-210919-161313) allows a remote, unauthenticated attacker to crash the device by triggering a buffer overflow in the gohead web-service handler at function sub_472f08 (FUN_00472f08). The CVSS 3.1 score of 7.5 reflects availability-only impact (A:H, C:N/I:N) over the network with no privileges or user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the device's gohead embedded web server (the management/HTTP interface); the attacker sends a crafted oversized request to the sub_472f08 request handler. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are mixed but internally consistent for a low-to-moderate real-world priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach the nv518G's gohead web management interface (e.g., an internet-exposed or LAN-adjacent router) sends a single crafted HTTP request with an oversized field to the sub_472f08 handler, overflowing an unchecked buffer and crashing the service or rebooting the device. Because AV:N/AC:L/PR:N/UI:N, this requires no authentication, no user interaction, and only network reachability; a third-party GitHub write-up describing FUN_00472f08 lowers the effort to reproduce it. |
| Remediation | No vendor-released patched firmware version is identified in the available data, so no exact fix version can be cited; check UTT's download center (https://utt.com.cn/downloadcenter.php?filetypeid=3&model=518G&lang=zhcn) for an updated 518G firmware image and apply it once released. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all UTT nv518G devices in production; disable or restrict access to the gohead web-service handler if feasible without operational impact. …
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Same weakness CWE-120 – Classic Buffer Overflow
View allSame technique Denial Of Service
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External POC / Exploit Code
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