CVE-2021-4021 Denial of service in radare2
Attackers can cause denial of service in Radare2 by mapping huge zero-filled sections in MIPS ELF64 binaries, leading to uncontrolled resource consumption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-4021?
CVE-2021-4021 is a high-severity denial of service vulnerability in Radare Radare2, published on 24 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in Radare2 in versions prior to 5.6.2, 5.6.0, 5.5.4 and 5.5.2. Mapping a huge section filled with zeros of an ELF64 binary for MIPS architecture can lead to uncontrolled resource consumption and DoS.
Which versions are affected by CVE-2021-4021?
It affects 1 product.
Products include Radare Radare2.
How do I fix CVE-2021-4021?
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-2021-4021 being exploited?
There is no known exploitation of CVE-2021-4021 in the wild and no public exploit code.
Other vulnerabilities in Radare Radare2
Sources
Also known as GHSA-4g55-4fxv-2g82, UBUNTU-CVE-2021-4021.