CVE-2011-3188

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.

Published: 2012-05-24 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-3188 is rated High Risk (70/100): CVSS Critical severity, with high exploitation likelihood (EPSS 5.69%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.37% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-3188

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 4.32% 5.69% +1.37%
2 2026-03-27 6.16% 4.32% -1.83%
3 2026-03-03 — 6.16% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-3188

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2011-3188

OS Trackers for CVE-2011-3188

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2011-3188
ubuntu medium CVE-2011-3188 medium priority: Ubuntu including 8 source packages (linux, linux-ec2, …), 48 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): DNE 24, released 20, not-affected 3, ignored 1. https://ubuntu.com/security/CVE-2011-3188

Affected software / configurations for CVE-2011-3188

Vendor Product Version Raw CPE
linux linux_kernel < 3.1 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
redhat enterprise_linux 4.0 cpe:2.3:o:redhat:enterprise_linux:4.0:*:*:*:*:*:*:*
f5 arx >= 6.0.0, <= 6.4.0 cpe:2.3:a:f5:arx:*:*:*:*:*:*:*:*
f5 big-ip_access_policy_manager >= 10.1.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
f5 big-ip_access_policy_manager >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
f5 big-ip_analytics >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*
f5 big-ip_application_security_manager >= 10.0.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_security_manager >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
f5 big-ip_edge_gateway >= 10.1.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:*
f5 big-ip_edge_gateway >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager >= 10.0.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_link_controller >= 10.0.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
f5 big-ip_link_controller >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager >= 10.0.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_protocol_security_module >= 10.0.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_protocol_security_module:*:*:*:*:*:*:*:*
f5 big-ip_protocol_security_module >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_protocol_security_module:*:*:*:*:*:*:*:*
f5 big-ip_wan_optimization_manager >= 10.0.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_wan_optimization_manager:*:*:*:*:*:*:*:*
f5 big-ip_wan_optimization_manager >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_wan_optimization_manager:*:*:*:*:*:*:*:*
f5 big-ip_webaccelerator >= 10.0.0, <= 10.2.4 cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:*
f5 big-ip_webaccelerator >= 11.0.0, <= 11.1.0 cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:*
f5 enterprise_manager >= 2.1.0, <= 2.3.0 cpe:2.3:a:f5:enterprise_manager:*:*:*:*:*:*:*:*
f5 enterprise_manager 3.0.0 cpe:2.3:a:f5:enterprise_manager:3.0.0:*:*:*:*:*:*:*
f5 firepass >= 6.0.0, <= 6.1.0 cpe:2.3:a:f5:firepass:*:*:*:*:*:*:*:*
f5 firepass 7.0.0 cpe:2.3:a:f5:firepass:7.0.0:*:*:*:*:*:*:*

References for CVE-2011-3188

URL Tags
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=6e5714eaf77d79ae1c8b47e3e040ff5411b717ec
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=bc0b96b54a21246e377122d54569eef71cec535f
http://marc.info/?l=bugtraq&m=139447903326211&w=2 Mailing List Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1 Mailing List Patch Vendor Advisory
http://www.openwall.com/lists/oss-security/2011/08/23/2 Mailing List Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=732658 Issue Tracking Patch Third Party Advisory
https://github.com/torvalds/linux/commit/6e5714eaf77d79ae1c8b47e3e040ff5411b717ec Patch Third Party Advisory
https://github.com/torvalds/linux/commit/bc0b96b54a21246e377122d54569eef71cec535f Patch Third Party Advisory
https://support.f5.com/csp/article/K15301?utm_source=f5support&amp%3Butm_medium=RSS
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