PatchTheCVECVE-2012-5363: The IPv6 implementation in FreeBSD and NetBSD (unknown versions, year 2012 and earlier) allows remote attacker
CVE-2012-5363 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.
The IPv6 implementation in FreeBSD and NetBSD (unknown versions, year 2012 and earlier) allows remote attackers to cause a denial of service via a flood of ICMPv6 Neighbor Solicitation messages, a different vulnerability than CVE-2011-2393.
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 | 2.6% (top 15%) |
| CISA exploited list | No |
| Weakness | CWE-400 |
| Published | 2020-02-20 |
| 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-2012-5363?
freebsd: upgrade to 9.2; netbsd: upgrade to 6.0.2. Exact commands for each OS are on this page.
Is CVE-2012-5363 being exploited?
CVE-2012-5363 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-2012-5363 affect?
CVE-2012-5363 affects freebsd, netbsd. Severity is high (CVSS 7.5). The IPv6 implementation in FreeBSD and NetBSD (unknown versions, year 2012 and earlier) allows remote attackers to cause a denial of service via a flood of ICMPv6 Neighbor Solicitation messages, a different vulnerability than CVE-2011-2393.
How urgent is CVE-2012-5363?
Priority 53/100. High severity; Remotely exploitable, no login, no user action
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