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PatchSiren cyber security CVE debrief

CVE-2018-19943 QNAP CVE debrief

CVE-2018-19943 is a cross-site scripting vulnerability affecting QNAP NAS File Station. CISA lists it in the Known Exploited Vulnerabilities catalog, which means it has been observed in active exploitation. CISA also marks it as having known ransomware campaign use, so exposed or internet-reachable QNAP NAS management interfaces should be treated as high priority for remediation.

Vendor
QNAP
Product
Network Attached Storage (NAS)
CVSS
HIGH 8
CISA KEV
Listed
Original CVE published
2022-05-24
Original CVE updated
2022-05-24
Advisory published
2022-05-24
Advisory updated
2022-05-24

Who should care

QNAP NAS administrators, especially teams that use or expose File Station and any management interface reachable from untrusted networks. Security operations teams should also pay attention because CISA has flagged this CVE as known exploited and associated with ransomware campaign use.

Technical summary

The issue is a cross-site scripting flaw in QNAP NAS File Station. The source corpus does not provide affected versions, exploit conditions, or vendor patch details, so only the existence and risk context can be stated with confidence. CISA’s KEV entry indicates active exploitation, and the catalog metadata marks known ransomware campaign use.

Defensive priority

High. This CVE is on CISA’s Known Exploited Vulnerabilities catalog and is tagged for known ransomware campaign use, so remediation should be prioritized over routine maintenance.

Recommended defensive actions

  • Apply updates per vendor instructions as soon as possible.
  • Review whether File Station or NAS management services are exposed to the internet and restrict access where possible.
  • Verify that the device is running the latest vendor-approved firmware or security update.
  • Audit for unexpected web session behavior, suspicious user actions, or signs of malicious script execution in the NAS interface.
  • If remediation cannot be immediate, isolate the device or limit access to trusted administrative networks only.

Evidence notes

Source evidence is limited to the CISA KEV entry and its metadata. The CISA record identifies the product as QNAP Network Attached Storage (NAS), the vulnerability name as QNAP NAS File Station Cross-Site Scripting Vulnerability, dateAdded as 2022-05-24, dueDate as 2022-06-14, and knownRansomwareCampaignUse as Known. No CVSS score or affected-version details were supplied in the corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2018-19943 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2018-19943

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2018-19943 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2018-19943

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.