CriticalCVE-2026-95377

    OS command injection via DHCP option 66 in Zenitel EdgeAudioClient TFTP provisioning (CVE-2026-95377)

    Published Last modified Sources: CVE.org, EUVD

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    What is affected, what to do

    OS command injection in the TFTP provisioning module of Zenitel EdgeAudioClient before 9.6.3.0, and 10.x before 10.1.3.0, on VSFF6, VSFF8, VSFF8MP, VSFF8MN, and VSFT devices allows unauthenticated adjacent attackers to execute arbitrary commands as root via a crafted DHCP option 66 (TFTP Server Name) value supplied by a rogue DHCP server on the same network segment. The DHCP-supplied value is passed to a shell without sanitization.

    Update Zenitel VSFF6 to version 9.6.3.0, Zenitel VSFF6 to version 10.1.3.0, Zenitel VSFF8 to version 9.6.3.0.

    Affected
    • Zenitel VSFF6 lt *..9.6.3.0
    • Zenitel VSFF6 lt 10.0.0.0..10.1.3.0
    • Zenitel VSFF8 lt *..9.6.3.0
    • Zenitel VSFF8 lt 10.0.0.0..10.1.3.0
    • Zenitel VSFF8MP lt *..9.6.3.0
    • Zenitel VSFF8MP lt 10.0.0.0..10.1.3.0
    • Zenitel VSFF8MN lt *..9.6.3.0
    • Zenitel VSFF8MN lt 10.0.0.0..10.1.3.0
    • Zenitel VSFT lt *..9.6.3.0
    • Zenitel VSFT lt 10.0.0.0..10.1.3.0
    Fixed in
    • Zenitel VSFF6 9.6.3.0
    • Zenitel VSFF6 10.1.3.0
    • Zenitel VSFF8 9.6.3.0
    • Zenitel VSFF8 10.1.3.0
    • Zenitel VSFF8MP 9.6.3.0
    • Zenitel VSFF8MP 10.1.3.0
    • Zenitel VSFF8MN 9.6.3.0
    • Zenitel VSFF8MN 10.1.3.0
    • Zenitel VSFT 9.6.3.0
    • Zenitel VSFT 10.1.3.0

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    9.4

    XIEM Effective CVSS

    Highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v4

    9.4

    CVSS v4

    Severity Critical on the scale from 0 to 10.

    Source: CVE.org, EUVD

    —

    EPSS score

    No value is available for this vulnerability.

    Show all metrics
    Severity
    Critical
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    77.00 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    9.4 Methodology
    CVSS v4

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    9.4
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · not automatable · Technical impact: total
    Source: CISA Vulnrichment, as of 13 November 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-78

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    OS command injection in the TFTP provisioning module of Zenitel EdgeAudioClient before 9.6.3.0, and 10.x before 10.1.3.0, on VSFF6, VSFF8, VSFF8MP, VSFF8MN, and VSFT devices allows unauthenticated adjacent attackers to execute arbitrary commands as root via a crafted DHCP option 66 (TFTP Server Name) value supplied by a rogue DHCP server on the same network segment. The DHCP-supplied value is passed to a shell without sanitization. Devices using DHCP, the default configuration, are affected on every boot and lease renewal. The same injection is also reachable via the config_update_tftp_server and sw_update_tftp_server configuration fields by an attacker able to modify the device configuration.

    Source: cvelistv5, ENISA EUVD, NVD (NIST), CVE.org (MITRE)

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    ZenitelVSFF6
    • 10.0.0.0 – < 10.1.3.0
    • < 9.6.3.0
    • 10.1.3.0
    • 9.6.3.0
    ZenitelVSFF8
    • 10.0.0.0 – < 10.1.3.0
    • < 9.6.3.0
    • 10.1.3.0
    • 9.6.3.0
    ZenitelVSFF8MN
    • < 9.6.3.0
    • 10.0.0.0 – < 10.1.3.0
    • 9.6.3.0
    • 10.1.3.0
    ZenitelVSFF8MP
    • 10.0.0.0 – < 10.1.3.0
    • < 9.6.3.0
    • 10.1.3.0
    • 9.6.3.0
    ZenitelVSFT
    • 10.0.0.0 – < 10.1.3.0
    • < 9.6.3.0
    • 10.1.3.0
    • 9.6.3.0

    Vendors and products

    Weakness classes (CWE)

    • CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

      Base

      The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

      Entry at MITRE CWE-78

    References & sources

    • zenitel.comsites/default/files/2026-11/A100K12404-Zenitel-Security-Advisor…euvd
    • NVD (NIST)vuln/detail/CVE-2026-95377euvd

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: none known, automatable: no

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-95377","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-11-13T19:51:26.769617Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. Receivedcf9c5165…

      CVSS V4.0: AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/S:P/AU:Y

      Weakness type: CWE-78

      Description added or changed

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      OS command injection in the TFTP provisioning module of Zenitel EdgeAudioClient before 9.6.3.0, and 10.x before 10.1.3.0, on VSFF6, VSFF8, VSFF8MP, VSFF8MN, and VSFT devices allows unauthenticated adjacent attackers to execute arbitrary commands as root via a crafted DHCP option 66 (TFTP Server Name) value supplied by a rogue DHCP server on the same network segment. The DHCP-supplied value is passed to a shell without sanitization. Devices using DHCP, the default configuration, are affected on every boot and lease renewal. The same injection is also reachable via the config_update_tftp_server and sw_update_tftp_server configuration fields by an attacker able to modify the device configuration.
      CVSSadded
      —
      AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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:Y/R:X/V:X/RE:X/U:X
      Weakness type (CWE)added
      —
      CWE-78
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/95xxx/CVE-2026-95377.json">CVE-2026-95377</a>
      Referenceadded
      —
      https://www.zenitel.com/sites/default/files/2026-11/A100K12404-Zenitel-Security-Advisory.pdf

      Source identifier: cf9c5165-6fe5-4ec0-b5f1-404f1df30a4e

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