CVE-2006-6870 Denial of service in n/a

What is CVE-2006-6870?

CVE-2006-6870 is a medium-severity denial of service vulnerability in n/a, published on 5 Jan 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The consume_labels function in avahi-core/dns.c in Avahi before 0.6.16 allows remote attackers to cause a denial of service (infinite loop) via a crafted compressed DNS response with a label that points to itself.

Which versions are affected by CVE-2006-6870?

It affects 1 product.

Products include Avahi Avahi.

How do I fix CVE-2006-6870?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2006-6870 being exploited?

There is no known exploitation of CVE-2006-6870 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2017-6519 Denial of service in n/a Critical 9.1
• CVE-2021-26720 Path traversal in n/a High 7.8
• CVE-2026-24401 Avahi has Uncontrolled Recursion in lookup_handle_cname function Medium 6.5
• CVE-2025-68468 Avahi has a reachable assertion in lookup_multicast_callback Medium 6.5
• CVE-2025-68471 Avahi has a reachable assertion in lookup_start Medium 6.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2006-6870, GHSA-mc78-8grw-5ghv.