Microsoft — Security Activity Report

Windows + Azure + Office (MSRC advisories)

Generated Nov 13, 2026Cohort: 9 vendors with ≥10 CVE advisoriesMethodology ↗

CVE Disclosure Volume

Total all-time: 34,847 CVEs with Microsoft advisories. Source: NVD CVE records joined with vendor advisory publish dates.

2,30820222,21020233,69220244,011202515,9322026

Severity Composition

↑ +1.9 pp

56.8% of Microsoft's 34,847 CVEs are CRITICAL or HIGH severity. Industry median: 54.9%. Source: NVD CVSS v3.1.

CRITICAL 1,888 (5.4%)HIGH 17,917 (51.4%)MEDIUM 12,189 (35.0%)LOW 696 (2.0%)NONE 2,134 (6.1%)

CISA KEV Listings

at industry median

140 of 23,848 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

↓ -8.3 days

Median time from CVE disclosure to Microsoft advisory: 3 days (p25 1 day – p75 23 days). Industry median: 11 days.

Sample size: 15,572 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 Free3,459 CVEs
  • CWE-122Heap-based Buffer Overflow1,980 CVEs
  • CWE-125Out-of-bounds Read1,607 CVEs
  • CWE-476NULL Pointer Dereference1,058 CVEs
  • CWE-20Improper Input Validation847 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 13, 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?

Email [email protected] with the specific number you're disputing and a link to the authoritative source. We review every report and publish corrections on the methodology page.