EUVD-2026-40866
GHSA-5j4v-722p-7pmr
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable gohead service exploitable without auth or interaction (AV:N/AC:L/PR:N/UI:N); buffer overflow only crashes the device, 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_416f28 component
AnalysisAI
Denial of service in the UTT nv518G gateway/router (firmware nv518GV3v3.2.7-210919-161313) lets a remote, unauthenticated attacker crash the device by triggering a buffer overflow in the gohead web-service function sub_416f28 (FUN_00416f28). Publicly available exploit code exists (referenced PoC on GitHub), though the flaw is not listed in CISA KEV and EPSS scores it at just 0.22% (13th percentile), indicating low observed exploitation activity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires only network reachability to the UTT nv518G's gohead web/management service and does not require authentication, credentials, or user interaction (CVSS PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are moderate and internally consistent. … 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 management service over the network sends a single crafted HTTP request whose oversized field overflows the fixed buffer in sub_416f28, crashing the daemon or rebooting the gateway and knocking connected users offline. Because the CVSS vector is AV:N/AC:L/PR:N/UI:N, no authentication, user interaction, or special timing is needed, and publicly available PoC/analysis on GitHub lowers the effort to reproduce it. … |
| Remediation | No vendor-released patch or fixed firmware version is identified in the available data, so a specific upgrade target cannot be cited; monitor the UTT download center (https://utt.com.cn/downloadcenter.php?filetypeid=3&model=518G&lang=zhcn) for an updated nv518G firmware build superseding nv518GV3v3.2.7-210919-161313. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Identify all UTT nv518G devices on the network; assess which are internet-facing or handle critical traffic; disable external access to the web management interface where operationally possible. …
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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
Leaving vuln.today