CVE-2019-25220 Denial of service in n/a
Remote attackers can crash Bitcoin Core nodes by flooding them with low-difficulty header chains, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-25220?
CVE-2019-25220 is a high-severity denial of service vulnerability in Bitcoin Bitcoin Core, published on 18 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Bitcoin Core before 24.0.1 allows remote attackers to cause a denial of service (daemon crash) via a flood of low-difficulty header chains (aka a "Chain Width Expansion" attack) because a node does not first verify that a presented chain has enough work before committing to store it.
Weakness: CWE-770
Which versions are affected by CVE-2019-25220?
It affects 1 product.
Products include Bitcoin Bitcoin Core.
How do I fix CVE-2019-25220?
No fix has been published for CVE-2019-25220 yet. Limit exposure of the affected software until one is available.
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-2019-25220 being exploited?
There is no known exploitation of CVE-2019-25220 in the wild and no public exploit code.
Other vulnerabilities in Bitcoin Bitcoin Core
Sources
Also known as GHSA-px5f-j76h-8w39.