Vulnerability Snapshot
CVE-1999-0511 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: windows_2000, windows_nt.
Executive Summary
IP forwarding is enabled on a machine which is not a router or firewall.
Why It Matters
CVE-1999-0511 is rated CRITICAL severity, requiring immediate attention from security teams.
CVSS Base Score: 9.1/10
EPSS (Exploit Prediction): 9.0% probability of exploitation in the next 30 days.
Affected Technologies
Vendors: microsoft
Products: windows_2000, windows_nt
🛡️What Defenders Should Check
Use Vulnios to continuously monitor your exposure to CVE-1999-0511 and similar vulnerabilities.
References & Sources
How Vulnios Detects This
Vulnios scans for this vulnerability using KEV cross-check that flags any host where this CVE is already on CISA's exploited list. 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.
AI Security Advisor
Powered by Gemini
Get AI-powered security recommendations tailored to this specific threat — including risk assessment, detection guidance, MITRE ATT&CK mapping, and actionable remediation steps.
Affected Products
Sources
Related Threat Alerts
- Critical Vulnerability: CVE-2025-53766 — microsoft — office, windows_10_1507
- Critical Vulnerability: CVE-2025-60724 — microsoft — office, office_long_term_servicing_channel
- Critical Vulnerability: CVE-2023-33150 — microsoft — 365_apps, office
- Critical Vulnerability: CVE-2016-7277 — microsoft — office
- Critical Vulnerability: CVE-2016-7182 — microsoft — live_meeting, lync
- Critical Vulnerability: CVE-2016-3312 — microsoft — windows_10
Frequently Asked Questions
What is CVE-1999-0511?
CVE-1999-0511 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. IP forwarding is enabled on a machine which is not a router or firewall.
Am I affected?
Check whether your environment runs windows_2000, windows_nt. 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-1999-0511. 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.
Protect Your Organization
Monitor CVEs, scan for vulnerabilities, and get real-time threat alerts — all in one platform.
Get instant alerts on Telegram
Join our public channel for real-time critical CVE alerts.
Follow @vulnios