PatchTheCVECVE-2011-2480: Information Disclosure vulnerability in the 802.11 stack, as used in FreeBSD before 8.2 and NetBSD when using
CVE-2011-2480 is a high-severity flaw (CVSS 7.5) affecting freebsd, netbsd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Information Disclosure vulnerability in the 802.11 stack, as used in FreeBSD before 8.2 and NetBSD when using certain non-x86 architectures. A signedness error in the IEEE80211_IOC_CHANINFO ioctl allows a local unprivileged user to cause the kernel to copy large amounts of kernel memory back to the user, disclosing potentially sensitive information.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.6% (top 24%) |
| CISA exploited list | No |
| Weakness | CWE-200 |
| Published | 2019-11-27 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2011-2480?
freebsd: upgrade to 8.2; netbsd: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2011-2480 being exploited?
CVE-2011-2480 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2011-2480 affect?
CVE-2011-2480 affects freebsd, netbsd. Severity is high (CVSS 7.5). Information Disclosure vulnerability in the 802.11 stack, as used in FreeBSD before 8.2 and NetBSD when using certain non-x86 architectures. A signedness error in the IEEE80211_IOC_CHANINFO ioctl allows a local unprivileged user to cause th
How urgent is CVE-2011-2480?
Priority 50/100. High severity; Remotely exploitable, no login, no user action
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