CVE-2011-3188
CRITICALCVSS 9.1/10EPSS 5.69%
Last modified
CVE-2011-3188 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 5.69% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 3.1 |
| Redhat | Enterprise Linux | 4.0 |
| F5 | Arx | >= 6.0.0, <= 6.4.0 |
| F5 | Big-Ip Access Policy Manager | >= 10.1.0, <= 10.2.4 |
| F5 | Big-Ip Access Policy Manager | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Analytics | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Application Security Manager | >= 10.0.0, <= 10.2.4 |
| F5 | Big-Ip Application Security Manager | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Edge Gateway | >= 10.1.0, <= 10.2.4 |
| F5 | Big-Ip Edge Gateway | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Global Traffic Manager | >= 10.0.0, <= 10.2.4 |
| F5 | Big-Ip Global Traffic Manager | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Link Controller | >= 10.0.0, <= 10.2.4 |
| F5 | Big-Ip Link Controller | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Local Traffic Manager | >= 10.0.0, <= 10.2.4 |
| F5 | Big-Ip Local Traffic Manager | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Protocol Security Module | >= 10.0.0, <= 10.2.4 |
| F5 | Big-Ip Protocol Security Module | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Wan Optimization Manager | >= 10.0.0, <= 10.2.4 |
| F5 | Big-Ip Wan Optimization Manager | >= 11.0.0, <= 11.1.0 |
| F5 | Big-Ip Webaccelerator | >= 10.0.0, <= 10.2.4 |
| F5 | Big-Ip Webaccelerator | >= 11.0.0, <= 11.1.0 |
| F5 | Enterprise Manager | >= 2.1.0, <= 2.3.0 |
| F5 | Enterprise Manager | 3.0.0 |
| F5 | Firepass | >= 6.0.0, <= 6.1.0 |
| F5 | Firepass | 7.0.0 |
References
- http://marc.info/?l=bugtraq&m=139447903326211&w=2Mailing List, Third Party Advisory
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1Mailing List, Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2011/08/23/2Mailing List, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=732658Issue Tracking, Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/6e5714eaf77d79ae1c8b47e3e040ff5411b717ecPatch, Third Party Advisory
- https://github.com/torvalds/linux/commit/bc0b96b54a21246e377122d54569eef71cec535fPatch, Third Party Advisory
- http://marc.info/?l=bugtraq&m=139447903326211&w=2Mailing List, Third Party Advisory
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1Mailing List, Patch, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2011/08/23/2Mailing List, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=732658Issue Tracking, Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/6e5714eaf77d79ae1c8b47e3e040ff5411b717ecPatch, Third Party Advisory
- https://github.com/torvalds/linux/commit/bc0b96b54a21246e377122d54569eef71cec535fPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2011-3188?
CVE-2011-3188 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 5.69% probability of exploitation in the next 30 days.
How do I fix CVE-2011-3188?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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