# CVE-2011-3188: Other in n/a

> Remote attackers can disrupt networking or hijack sessions by predicting weak IPv4/IPv6 sequence numbers generated by the Linux kernel.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 May 2012
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-93rr-wh56-p8fw

## What is CVE-2011-3188?

CVE-2011-3188 is a critical vulnerability in F5 Big-Ip Access Policy Manager, published on 24 May 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

## Which versions are affected by CVE-2011-3188?

It affects 15 products.


Products: F5 Arx, F5 Big-Ip Access Policy Manager, F5 Big-Ip Analytics, F5 Big-Ip Application Security Manager, F5 Big-Ip Edge Gateway, F5 Big-Ip Global Traffic Manager, F5 Big-Ip Link Controller, F5 Big-Ip Local Traffic Manager, F5 Big-Ip Protocol Security Module, F5 Big-Ip Wan Optimization Manager, F5 Big-Ip Webaccelerator, F5 Enterprise Manager, F5 Firepass, Linux kernel, Redhat Enterprise Linux.

## How do I fix CVE-2011-3188?

Upgrade to a fixed version.

## Is CVE-2011-3188 being exploited?

There is no known exploitation of CVE-2011-3188 in the wild and no public exploit code.

## Other vulnerabilities in F5 Big-Ip Access Policy Manager

- [CVE-2014-2927](https://insights.sbomify.com/CVE-2014-2927/): Auth bypass in n/a (critical 9.3)
- [CVE-2013-3587](https://insights.sbomify.com/CVE-2013-3587/): Information disclosure in HTTPS protocol (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-3188 and fix it if it is affected.

What it is: CVE-2011-3188 is a critical vulnerability in F5 Big-Ip Access Policy Manager, published on 24 May 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2011-3188 in the wild and no public exploit code.

Affected product: F5 Big-Ip Access Policy Manager. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2011-3188/ (Markdown: https://insights.sbomify.com/CVE-2011-3188/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-3188
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-3188
- OSV: https://osv.dev/vulnerability/CVE-2011-3188

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-3188/
Summaries are generated and may contain mistakes; the official description above is the record.