EUVD-2026-64998
GHSA-w265-5q4m-22wq
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
Network-reachable via web UI (AV:N/AC:L), admin authentication mandatory (PR:H), no scope change to other systems (S:U), full impact triad if code execution achieved (C:H/I:H/A:H).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Multiple DrayTek VigorSwitch models contain a buffer overflow vulnerability in the acl_general_setup Add ACE function. The vulnerability is caused by copying the name field into a fixed-size buffer without length validation. 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 DrayTek VigorSwitch's ACL configuration function exposes authenticated administrators to denial of service or potential arbitrary command execution via the device's web management interface. The root cause - an unbounded strcpy-style copy of a user-supplied name field into a fixed-size stack or heap buffer inside acl_general_setup's Add ACE handler - is a classic CWE-120 defect reachable over the network from any host with management-plane access. …
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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 web management interface - CVSS PR:H explicitly confirms this authentication requirement. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.6 reflects severe potential impact (VC:H/VI:H/VA:H) but is tempered by the PR:H requirement, meaning exploitation demands prior administrative compromise of the device. … 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 the firmware update referenced in DrayTek's August 2026 security advisory at https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/; patch available per vendor advisory, but exact fixed firmware version numbers are not specified in the available data and should be confirmed directly with DrayTek or the advisory page. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all DrayTek VigorSwitch deployments and map current administrative access patterns and users interacting with ACL configuration. …
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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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