EUVD-2026-66955
GHSA-fgmh-w4xc-3q4h
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 vector with user-privilege requirement reflects VT upload access; no scope change as full impact is contained within the scanner system itself.
Primary rating from Vendor (CERTVDE).
CVSS VectorVendor: CERTVDE
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Lifecycle Timeline
2DescriptionCVE.org
A remote attacker with user privileges may use a malicious or compromised NASL vulnerability test (VT) on the affected products to trigger a stack buffer overflow and gain full access on the compromised system.
AnalysisAI
Stack buffer overflow in Greenbone's OpenVAS Scanner and Greenbone OS allows a remote attacker holding user-level privileges to achieve full system compromise by supplying a malicious or compromised NASL vulnerability test (VT). Both the Greenbone OS platform and the openvas-scanner engine are confirmed affected, making this a meaningful risk in any multi-user GVM deployment or environment where user accounts may be compromised. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold user-level privileges on the target Greenbone GVM or OpenVAS deployment - specifically, the ability to upload, inject, or modify NASL VT content in the scanner's feed or task configuration. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) reflects a high-severity, low-complexity network attack requiring only user-level credentials and no user interaction - realistic in any GVM instance with multiple provisioned accounts. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained user credentials on a Greenbone GVM deployment - through phishing, credential stuffing, or insider access - uploads a specially crafted NASL VT to the scanner's feed or task configuration. When the openvas-scanner process executes the malicious VT during a scan task, the crafted content triggers a stack buffer overflow in the NASL interpreter, overwriting the return address and redirecting execution to attacker-controlled code. … |
| Remediation | Consult the Greenbone CSAF security advisory GBSA2026-03 at https://www.greenbone.net/.well-known/csaf/white/2026/gbsa2026-03.json for authoritative fixed version numbers and upgrade instructions, as specific patch versions are not available from the current data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all Greenbone OS and OpenVAS Scanner instances across your infrastructure, document affected versions, and immediately restrict NASL test upload permissions to administrative-only accounts with MFA enforcement. …
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External POC / Exploit Code
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