EUVD-2026-64995
GHSA-v8w8-j3hm-5q73
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Administrative credentials explicitly required per description (PR:H); management interface is network-reachable (AV:N); full C/I/A impact plausible for buffer overflow with command execution; no scope change as only the switch itself is affected.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the sysreboot function. The vulnerability is caused by unsafe concatenation of split valueN data into a fixed-size buffer. A remote attacker can trigger this vulnerability via crafted input, causing a denial of service or potentially executing arbitrary commands. Exploitation requires valid administrative credentials for the device's web management interface.
AnalysisAI
Buffer overflow in the sysreboot function of multiple DrayTek VigorSwitch managed switch models allows authenticated remote attackers to cause denial of service or execute arbitrary commands. The root cause (CWE-120) is unsafe concatenation of split valueN attacker-controlled data into a fixed-size buffer in the device's web management firmware, exploitable over the network by any party holding valid administrative credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires valid administrative credentials for the DrayTek VigorSwitch HTTP/HTTPS web management interface - this is the primary and explicit gating condition stated in the CVE description. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) scores 8.6 and reflects a network-exploitable flaw with low attack complexity, but with a critical prerequisite: valid administrative credentials (PR:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply firmware updates per the DrayTek security advisory at https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/ - no specific fixed firmware version numbers were present in the provided intelligence, so the advisory must be consulted directly for the correct version per model. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all administrative access to affected DrayTek VigorSwitch models and review recent management interface logs for any suspicious activity. …
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Same weakness CWE-120 – Classic Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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