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    MedTech Cybersecurity · Since 2022

    Goat Feed · KEV

    CISA KEV: Microsoft Windows CVE-2026-21510 - Windows Shell Protection Mechanism Failure Vulnerability

    Microsoft Windows Shell contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network.

    Back to the daily feed
    KEV
    criticalPublished June 22, 2026 at 3:46 AM UTC
    Blue Goat take· Blue Goat Cyber Research

    This vulnerability allows attackers to bypass network security controls on Windows systems without local access. Manufacturers using Windows based imaging systems or hospital workstations are most exposed, as these devices often lack the isolation needed to prevent remote shell exploitation. Security leads should assess exposure and prioritize patching these endpoints. The CISA due date binds federal agencies, not manufacturers; timely, risk-based remediation is still good postmarket practice.

    Blue Goat Risk Score

    Blue Goat Cyber MedTech rubric v1.0 · methodology

    7.3
    of 10
    high
    CVSS technical
    40% · +1.6

    Not published

    Patient safety
    35% · +3.5

    Life-threatening

    Exploit maturity
    15% · +1.5

    On CISA KEV (in-the-wild)

    MedTech exposure
    10% · +0.7

    7/10 network-reachable signals

    How we got to 7.3

    1. 1
      CVSS technical severity (40%)

      Industry-standard exploitability + impact score. We prefer CVSS 4.0 and fall back to 3.1 per the FDA's Feb 2026 premarket cybersecurity guidance. Missing CVSS scores get a neutral 4.0 so unknown vulns are not over- or under-rated.

      No CVSS published yet · neutral 4.0 × 40% = +1.60
    2. 2
      Patient safety impact (35%)

      What happens to a patient if this vuln is exploited on a connected device. Auto-inferred from headline, dek, tags, and device class against a curated MedTech keyword library (pacemaker, infusion pump, EHR, PACS, etc.).

      Life-threatening → 10 × 35% = +3.50
    3. 3
      Exploit maturity (15%)

      Is anyone actually using this in attacks? KEV listing > weaponized exploit > public PoC > none. KEV alone forces tier=critical regardless of CVSS.

      On CISA KEV (in-the-wild) → 10 × 15% = +1.50
    4. 4
      MedTech exposure (10%)

      How likely this affects clinical operations: presence in our MedTech feed (+4 baseline), network-reachable signals (+3), known device-class tags (+2), identified MedTech vendor (+1).

      Exposure 7/10 × 10% = +0.70

    Tier cutoffs: Critical ≥ 8.5 · High 7.0–8.4 · Notable 4.0–6.9 · Info < 4.0. Full methodology, weights, and changelog at /goatfeed/risk-rubric.

    Citations
    • CISA Known Exploited Vulnerabilities
    • Methodology and sources →
    #kev#cve#microsoft
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