CVE-2006-6858: Miredo 0.9.8 through 1.0.5 does not properly authenticate a Teredo bubble during UDP hole punching with HMAC-M

Q: How do I fix CVE-2006-6858?

miredo: upgrade to newer than 1.0.5. Exact commands for each OS are on this page.

Q: Is CVE-2006-6858 being exploited?

CVE-2006-6858 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2006-6858 affect?

CVE-2006-6858 affects miredo. Severity is medium (CVSS 6.8). Miredo 0.9.8 through 1.0.5 does not properly authenticate a Teredo bubble during UDP hole punching with HMAC-MD5-64 hashing, which allows remote attackers to impersonate an arbitrary Teredo client.

Q: How urgent is CVE-2006-6858?

Priority 41/100. No elevated risk signals yet.

This month

MEDIUM 6.8UPGRADE

CVE-2006-6858 is a medium-severity flaw (CVSS 6.8) affecting miredo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Miredo 0.9.8 through 1.0.5 does not properly authenticate a Teredo bubble during UDP hole punching with HMAC-MD5-64 hashing, which allows remote attackers to impersonate an arbitrary Teredo client.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Published	2006-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: miredo

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:33 UTCUpdated Record last modified

miredo miredo UPGRADE

Affected: <= 1.0.5 · 0.9.8 · 1.0.3 · 1.0.4

Fixed in: newer than 1.0.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy miredo || rpm -q miredo || miredo --version

2. UPGRADE to newer than 1.0.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade miredo

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade miredo

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2006-6858?

miredo: upgrade to newer than 1.0.5. Exact commands for each OS are on this page.

Is CVE-2006-6858 being exploited?

CVE-2006-6858 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-2006-6858 affect?

CVE-2006-6858 affects miredo. Severity is medium (CVSS 6.8). Miredo 0.9.8 through 1.0.5 does not properly authenticate a Teredo bubble during UDP hole punching with HMAC-MD5-64 hashing, which allows remote attackers to impersonate an arbitrary Teredo client.

How urgent is CVE-2006-6858?

Priority 41/100. No elevated risk signals yet.

References

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