ReservedCVE-2026-28311

    SolarWinds Serv-U: security vulnerability (CVE-2026-28311)

    Published Sources: SingCERT, BSI

    What is affected, what to do

    Attackers can exploit two critical vulnerabilities in SolarWinds Serv-U to perform remote code execution. Patch immediately.

    Update SolarWinds Serv-U to version 2026.3.

    Affected
    • SolarWinds Serv-U < *..2026.3
    Fixed in
    • SolarWinds Serv-U 2026.3

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

    Metrics

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    Priority

    No value is available for this vulnerability.

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    CVSS v3

    No value is available for this vulnerability.

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    EPSS score

    No value is available for this vulnerability.

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    Severity
    Reserved
    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
    91.76 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.

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    no public PoC known
    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.

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    Published

    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.

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    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.

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    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.

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

    Description

    Attackers can exploit two critical vulnerabilities in SolarWinds Serv-U to perform remote code execution. Patch immediately. Background SolarWinds has released security updates to address two vulnerabilities (CVE-2026-28304 and CVE-2026-28311) affecting SolarWinds Serv-U. SolarWinds Serv-U is a multi-protocol file server capable of sending and receiving files from other networked computers. These vulnerabilities have a Common Vulnerability Scoring System (CVSS v3.1) score of 9.1 out of 10. Impact Successful exploitation of these vulnerabilities could lead to the following: CVE-2026-28304: A remote code execution vulnerability that can allow an attacker to execute arbitrary code as root. CVE-2026-28311: A remote code execution vulnerability that can allow a domain administrator to modify how the application behaves and perform remote code execution. Affected Products These vulnerabilities affect SolarWinds Serv-U versions 15.5.4 HF1 and below. Recommendations Users and administrators of affected products are advised to update to the latest versions immediately. References https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28304 https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28311

    Source: CSA/SingCERT, BSI CSAF, BSI WID Portal

    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
    SolarWindsServ-U
    • < 2026.3
    • 2026.3

    Vendors and products

    Included in the same advisory

    Included in the same advisory
    CriticalCVE-2026-28304SolarWinds Serv-U Remote Code Execution Vulnerability9.1—
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    <a href="https://intel.neosec.eu/en/cve/CVE-2026-28311"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-28311.svg?lang=en" alt="CVE-2026-28311 – NEOSEC Intel" height="20"></a>