CVE-2020-6078 Null dereference in Videolabs

What is CVE-2020-6078?

CVE-2020-6078 is a high-severity vulnerability in Debian Debian Linux, published on 24 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An exploitable denial-of-service vulnerability exists in the message-parsing functionality of Videolabs libmicrodns 0.1.0. When parsing mDNS messages in mdns_recv, the return value of the mdns_read_header function is not checked, leading to an uninitialized variable usage that eventually results in a null pointer dereference, leading to service crash. An attacker can send a series of mDNS messages to trigger this vulnerability.

Weakness: CWE-252

Which versions are affected by CVE-2020-6078?

It affects 2 products.

Products include Debian Debian Linux, Videolabs Libmicrodns.

How do I fix CVE-2020-6078?

Upgrade to a fixed version.

Is CVE-2020-6078 being exploited?

There is no known exploitation of CVE-2020-6078 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2020-6078, GHSA-4jhw-hrr3-2hpg, UBUNTU-CVE-2020-6078.