Vulnerability Snapshot
CVE-2011-3188 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: linux_kernel, enterprise_linux, arx, big-ip_access_policy_manager, big-ip_analytics, plus 5 other product variants.
Executive Summary
The (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to generate sequence numbers and Fragment Identification values, which makes it easier for remote attackers to cause a denial of service (disrupted networking) or hijack network sessions by predicting these values and sending crafted packets.
Why It Matters
CVE-2011-3188 is rated CRITICAL severity, requiring immediate attention from security teams.
CVSS Base Score: 9.1/10
Affected Technologies
Vendors: linux, redhat, f5
Products: linux_kernel, enterprise_linux, arx, big-ip_access_policy_manager, big-ip_analytics, big-ip_application_security_manager, big-ip_edge_gateway, big-ip_global_traffic_manager, big-ip_link_controller, big-ip_local_traffic_manager, big-ip_protocol_security_module, big-ip_wan_optimization_manager, big-ip_webaccelerator, enterprise_manager, firepass
🛡️What Defenders Should Check
Use Vulnios to continuously monitor your exposure to CVE-2011-3188 and similar vulnerabilities.
References & Sources
How Vulnios Detects This
Vulnios scans for this vulnerability using Trivy and Grype for CVE matching against your container images and OS package manifests. 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.
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Affected Products
Sources
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Frequently Asked Questions
What is CVE-2011-3188?
CVE-2011-3188 is a critical-severity vulnerability tracked under the Common Vulnerabilities and Exposures program. The (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to generate sequence numbers and Fragment Identification values, which makes it easier for remote
Am I affected?
Check whether your environment runs linux_kernel, enterprise_linux, arx, big-ip_access_policy_manager, big-ip_analytics. 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-2011-3188. 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.
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