EUVD-2026-34907
GHSA-4vmg-9v32-fh3f
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:L/SC:L/SI:L/SA:L/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:P/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:L/SC:L/SI:L/SA:L/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:P/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
1DescriptionCVE.org
A Captive Portal Custom Handler command injection vulnerability exists in Arista Edge Threat Management - Arista Next Generation Firewall (NGFW). On affected platforms, an administrative account logged into the user interface can exploit this input handling behavior to execute arbitrary platform shell commands.
AnalysisAI
Command injection in Arista Edge Threat Management Next Generation Firewall (NGFW) Captive Portal Custom Handler allows administrators authenticated to the management UI to execute arbitrary shell commands on the underlying platform. The CVSS 4.0 score of 7.0 reflects high privilege requirements (PR:H) offset by network reach and high confidentiality impact, with no public exploit identified at time of analysis.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated administrative session in the NGFW user interface (CVSS PR:H) and that the attacker can reach the management UI over the network (AV:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/PR:H/UI:N) confirms remote network reachability with low attack complexity but requires high privileges - an attacker must already hold administrative UI credentials. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained NGFW administrator credentials - for example via phishing, credential reuse, or a prior compromise - logs into the management UI and edits the captive portal custom handler configuration to embed shell metacharacters or chained commands in a field that the handler later passes to the OS shell. When the handler executes, the injected payload runs on the firewall appliance, giving the attacker a foothold on a network-edge device from which they can pivot, sniff traffic, or disable security controls. |
| Remediation | Apply the fixed release identified in Arista security advisory 0133 (https://www.arista.com/en/support/advisories-notices/security-advisory/23399-security-advisory-0133); the supplied data does not include an exact fix version, so consult the advisory for the patched build number. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit all systems running Arista NGFW with Captive Portal Custom Handler; enforce multi-factor authentication for management UI access and restrict admin role assignments to essential personnel only. …
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