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CVE-2020-7533

Critical Vulnerability: CVE-2020-7533 — schneider-electric — modicon_m340_bmxp3420302_firmware, modicon_m340_bmxp3420302

CWE-287: Improper Authentication vulnerability exists which could cause the execution of commands on the webserver without authentication when sending specially crafted HTTP requests.

Sunday, September 6, 2026schneider-electricVulnios Threat Intelligence
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Vulnerability Snapshot

CVE-2020-7533 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: modicon_m340_bmxp3420302_firmware, modicon_m340_bmxp3420302, modicon_m340_bmxp342000_firmware, modicon_m340_bmxp342000, modicon_m340_bmxp341000_firmware, plus 5 other product variants.

Executive Summary

CWE-287: Improper Authentication vulnerability exists which could cause the execution of

commands on the webserver without authentication when sending specially crafted HTTP

requests.

Why It Matters

CVE-2020-7533 is rated CRITICAL severity, requiring immediate attention from security teams.

CVSS Base Score: 9.8/10

Affected Technologies

Vendors: schneider-electric

Products: modicon_m340_bmxp3420302_firmware, modicon_m340_bmxp3420302, modicon_m340_bmxp342000_firmware, modicon_m340_bmxp342000, modicon_m340_bmxp341000_firmware, modicon_m340_bmxp341000, modicon_m340_bmxp3420102_firmware, modicon_m340_bmxp3420102, bmxnoe0100_firmware, bmxnoe0100, bmxnoe0110_firmware, bmxnoe0110, bmxnoc0401_firmware, bmxnoc0401, tsxp574634_firmware, tsxp574634, tsxp575634_firmware, tsxp575634, tsxp576634_firmware, tsxp576634, tsxety4103_firmware, tsxety4103, tsxety5103_firmware, tsxety5103, 140noe77111_firmware, 140noe77111, 140noc78000_firmware, 140noc78000, 140noc77101_firmware, 140noc77101, 140cpu65260_firmware, 140cpu65260

🛡️What Defenders Should Check

  • Check if you are affected — Review your asset inventory for products listed in CVE-2020-7533.
  • 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-2020-7533 and similar vulnerabilities.

    References & Sources

  • https://download.schneider-electric.com/files?p_File_Name=SEVD-2020-287-01_Modicon_Web_Server_Security_Notificatiton.pdf&p_Doc_Ref=SEVD-2020-287-01&p_enDocType=Security+and+Safety+Notice
  • https://www.se.com/ww/en/download/document/SEVD-2020-287-01/

    • 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

    modicon_m340_bmxp3420302_firmwaremodicon_m340_bmxp3420302modicon_m340_bmxp342000_firmwaremodicon_m340_bmxp342000modicon_m340_bmxp341000_firmwaremodicon_m340_bmxp341000modicon_m340_bmxp3420102_firmwaremodicon_m340_bmxp3420102bmxnoe0100_firmwarebmxnoe0100

    Sources

    Related Threat Alerts

    Frequently Asked Questions

    What is CVE-2020-7533?

    CVE-2020-7533 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. CWE-287: Improper Authentication vulnerability exists which could cause the execution of

    commands on the webserver without authentication when sending specially crafted HTTP

    requests.

    Am I affected?

    Check whether your environment runs modicon_m340_bmxp3420302_firmware, modicon_m340_bmxp3420302, modicon_m340_bmxp342000_firmware, modicon_m340_bmxp342000, modicon_m340_bmxp341000_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-2020-7533. 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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