CVE-2021-45956 Memory corruption in n/a

Critical 9.8 Published 31 Dec 2021 Updated 28 Oct 2024

Heap-based buffer overflow in Dnsmasq's print_mac function allows attackers to potentially execute code or cause denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2021-45956?

CVE-2021-45956 is a critical memory corruption vulnerability in n/a, published on 31 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Dnsmasq 2.86 has a heap-based buffer overflow in print_mac (called from log_packet and dhcp_reply). NOTE: the vendor's position is that CVE-2021-45951 through CVE-2021-45957 "do not represent real vulnerabilities, to the best of our knowledge.

Weakness: CWE-787

Which versions are affected by CVE-2021-45956?

It affects 1 product.

Products include Thekelleys Dnsmasq.

How do I fix CVE-2021-45956?

No fix published yet.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-45956 being exploited?

There is no known exploitation of CVE-2021-45956 in the wild and no public exploit code.

Sources

Also known as AZL-8963, GHSA-c76g-xw7w-9qj6.