OS Vulnerability Categories
May 2023 Patch Tuesday| Category | What It Allows | Severity | May 2023 Count |
|---|---|---|---|
| Remote Code Execution | Attacker runs arbitrary code on target remotely | Critical | 12 |
| Elevation of Privilege | Attacker gains higher access than permitted | High | 8 |
| Information Disclosure | Sensitive data exposed to unauthorized parties | Medium–High | 8 |
| Denial of Service | System/service made unavailable | Medium | 5 |
| Security Feature Bypass | Built-in security controls circumvented | Medium–High | 4 |
| Spoofing | Attacker impersonates legitimate user or system | Medium | 1 |
| Total | — | — | ~50 |
Patch Management Process
6 StepsPatch Released
Vendor publishes security update (e.g., Patch Tuesday). Vulnerability details become public. Clock starts: attackers begin reverse engineering.
Assess
Security team reviews patch details: which systems are affected, severity ratings, whether exploits are known in the wild. Critical patches may skip the normal schedule.
Test
Deploy patches to isolated test environment. Run application compatibility tests. Check that business-critical software still functions. Typical window: 3–7 days.
Pilot
Roll out to a small representative group (5–10% of endpoints). Monitor for issues 24–48 hours before proceeding.
Deploy
Full production rollout. Schedule maintenance windows for systems requiring reboots. Track restart-pending status separately from installation status.
Verify + Backup
Confirm all systems show patched AND restarted. Maintain pre-patch system images as rollback capability. Document any patches excluded due to conflicts.
The Patching Race — Timeline
Defender vs. Attacker| Time After Patch Release | Defender Activity | Attacker Activity |
|---|---|---|
| Day 0 (Patch Tuesday) | Patch published, assessment begins | Patch downloaded, reverse engineering begins |
| Day 1–2 | Test environment deployment | Vulnerability analysis completed |
| Day 3–5 | Compatibility testing, pilot rollout | Proof-of-concept exploit code being developed |
| Day 5–7 | Full production deployment begins | Exploit code may be publicly available |
| Day 7+ | Stragglers and exceptions handled | Automated scanning for unpatched systems begins |
The window between patch release and working exploit code is shrinking. For some vulnerabilities it is measured in hours. Organizations that have not patched within this window are increasingly likely to be targeted.