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CVE-2020-6959

Critical Vulnerability: CVE-2020-6959 — honeywell — maxpro_nvr_xe_firmware, maxpro_nvr_xe

The following versions of MAXPRO VMS and NVR, MAXPRO VMS:HNMSWVMS prior to Version VMS560 Build 595 T2-Patch, HNMSWVMSLT prior to Version VMS560 Build 595 T2-Patch, MAXPRO NVR: MAXPRO NVR XE prior to Version NVR 5.6 Build 595 T2-Patch, MAXPRO NVR SE prior to Version NVR 5.6 Build 595 T2-Patch, MAXPRO NVR PE prior to Version NVR 5.6 Build 595 T2-Patch, and MPNVRSWXX prior to Version NVR 5.6 Build 595 T2-Patch are vulnerable to an unsafe deserialization of untrusted data. An attacker may be able t

Friday, August 7, 2026honeywellVulnios Threat Intelligence
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Vulnerability Snapshot

CVE-2020-6959 is rated CRITICAL — exploitation is trivial or already observed in the wild and impact is severe. Patch immediately, not on the next maintenance window.

Affected technology: maxpro_nvr_xe_firmware, maxpro_nvr_xe, maxpro_nvr_se_firmware, maxpro_nvr_se, maxpro_nvr_pe_firmware, plus 5 other product variants.

Executive Summary

The following versions of MAXPRO VMS and NVR, MAXPRO VMS:HNMSWVMS prior to Version VMS560 Build 595 T2-Patch, HNMSWVMSLT prior to Version VMS560 Build 595 T2-Patch, MAXPRO NVR: MAXPRO NVR XE prior to Version NVR 5.6 Build 595 T2-Patch, MAXPRO NVR SE prior to Version NVR 5.6 Build 595 T2-Patch, MAXPRO NVR PE prior to Version NVR 5.6 Build 595 T2-Patch, and MPNVRSWXX prior to Version NVR 5.6 Build 595 T2-Patch are vulnerable to an unsafe deserialization of untrusted data. An attacker may be able to remotely modify deserialized data without authentication using a specially crafted web request, resulting in remote code execution.

Why It Matters

CVE-2020-6959 is rated CRITICAL severity, requiring immediate attention from security teams.

CVSS Base Score: 9.8/10

Affected Technologies

Vendors: honeywell

Products: maxpro_nvr_xe_firmware, maxpro_nvr_xe, maxpro_nvr_se_firmware, maxpro_nvr_se, maxpro_nvr_pe_firmware, maxpro_nvr_pe, mpnvrswxx_firmware, mpnvrswxx, hnmswvms_firmware, hnmswvms, hnmswvmslt_firmware, hnmswvmslt

🛡️What Defenders Should Check

  • Check if you are affected — Review your asset inventory for products listed in CVE-2020-6959.
  • Apply available patches — Visit vendor advisories for the latest security updates.
  • Monitor for exploitation — Check your SIEM/IDS logs for related indicators.

    • Use Vulnios to continuously monitor your exposure to CVE-2020-6959 and similar vulnerabilities.

    References & Sources

  • https://www.us-cert.gov/ics/advisories/icsa-20-021-01
  • https://www.us-cert.gov/ics/advisories/icsa-20-021-01

    • How Vulnios Detects This

    Vulnios scans for this vulnerability using Trivy and Grype for SBOM-based CVE matching and Vulnios CVE feed continuous monitoring against your asset inventory. Run a scan against your environment to see whether you are exposed; findings are linked back to the original CVE record so triage starts with the patch path already known.

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    Affected Products

    maxpro_nvr_xe_firmwaremaxpro_nvr_xemaxpro_nvr_se_firmwaremaxpro_nvr_semaxpro_nvr_pe_firmwaremaxpro_nvr_pempnvrswxx_firmwarempnvrswxxhnmswvms_firmwarehnmswvms

    Sources

    Related Threat Alerts

    Frequently Asked Questions

    What is CVE-2020-6959?

    CVE-2020-6959 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. The following versions of MAXPRO VMS and NVR, MAXPRO VMS:HNMSWVMS prior to Version VMS560 Build 595 T2-Patch, HNMSWVMSLT prior to Version VMS560 Build 595 T2-Patch, MAXPRO NVR: MAXPRO NVR XE prior to

    Am I affected?

    Check whether your environment runs maxpro_nvr_xe_firmware, maxpro_nvr_xe, maxpro_nvr_se_firmware, maxpro_nvr_se, maxpro_nvr_pe_firmware. If you operate any of those, treat yourself as in scope until you have evidence otherwise. A Vulnios scan will identify the exact assets carrying the affected version.

    How urgent is the response?

    Critical: do not wait for your normal patch cycle. Verify exposure today, apply the vendor patch immediately, and add detection rules for any post-exploit indicators.

    How do I remediate?

    Apply the vendor patch listed in the upstream advisory linked under Sources. If the patch is not yet available, follow the vendor-supplied workaround (often a config flag or feature disable) and add detections for the published exploit pattern in your SIEM. Re-scan after the patch lands to confirm the finding clears.

    Where can I track exploitation activity?

    Watch CISA's Known Exploited Vulnerabilities catalog for CVE-2020-6959. Cross-reference with public exploit databases and your own SIEM/IDS for indicator-of-compromise patterns. Vulnios tracks KEV status automatically and surfaces it on the asset findings view.

    How does Vulnios help with this?

    Vulnios continuously cross-references your asset inventory against the live CVE feed (NVD, vendor advisories, CISA KEV, and curated OSINT). When a new CVE matches your environment, you get a prioritized finding with the severity, KEV status, exploit-prediction (EPSS), and a direct path to the vendor patch. You can start a free scan from the homepage.

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