Microsoft — Security Activity Report

Windows + Azure + Office (MSRC advisories)

Generated Nov 2, 2026Cohort: 9 vendors with ≥10 CVE advisoriesMethodology ↗

CVE Disclosure Volume

Total all-time: 33,305 CVEs with Microsoft advisories. Source: NVD CVE records joined with vendor advisory publish dates.

2,30020222,20920233,69120244,010202514,4182026

Severity Composition

↑ +2.4 pp

56.2% of Microsoft's 33,305 CVEs are CRITICAL or HIGH severity. Industry median: 53.8%. Source: NVD CVSS v3.1.

CRITICAL 1,824 (5.5%)HIGH 16,903 (50.8%)MEDIUM 11,688 (35.1%)LOW 685 (2.1%)NONE 2,130 (6.4%)

CISA KEV Listings

at industry median

138 of 22,366 Microsoft CVEs in the last 3 years are on CISA's Known Exploited Vulnerabilities catalog (0.6%). Industry median: 0.6%.

Source: CISA Known Exploited Vulnerabilities catalog (current snapshot). KEV listing means CISA observed active in-the-wild exploitation.

Vendor Patch Velocity

↓ -8.6 days

Median time from CVE disclosure to Microsoft advisory: 3 days (p25 1 day – p75 24 days). Industry median: 11 days.

Sample size: 15,177 CVE→advisory pairs over the last 3 years. Source: vendor advisory published_at minus CVE published.

Top Recurring Weakness Classes

Most-frequently mapped CWEs across Microsoft's last 3 years of CVE disclosures. Source: NVD — CWE mapping per MITRE taxonomy.

  • CWE-416Use After Free3,152 CVEs
  • CWE-122Heap-based Buffer Overflow1,669 CVEs
  • CWE-125Out-of-bounds Read1,476 CVEs
  • CWE-476NULL Pointer Dereference1,033 CVEs
  • CWE-20Improper Input Validation815 CVEs

Recent Security Advisories

Latest advisories published by Microsoft, straight from the vendor's own feed. Severity labels are the vendor's — scales differ across vendors.

Full advisory archive: /pulse/vendor-advisories →

Data sources & corrections

  • NVD National Vulnerability Database (nvd.nist.gov) — CVE records + CVSS v3.1 severity
  • MITRE cvelistV5 (github.com/CVEProject/cvelistV5) — CNA-published CVE timestamps
  • CISA Known Exploited Vulnerabilities catalog (cisa.gov/known-exploited-vulnerabilities-catalog)
  • Vendor security advisories (Red Hat RHSA, Ubuntu USN, Microsoft MSRC, Cisco PSIRT and other per-vendor feeds; the GitHub and OSV advisory databases are not used) — published_at timestamps
  • MITRE CWE taxonomy (cwe.mitre.org) — weakness class mappings

Snapshot generated Nov 2, 2026: when these counts and industry medians were computed. Vendors in the index are recomputed every 6 hours.

Spot a factual error in this report?

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