CVE-2011-4869 Denial of service in n/a
Remote attackers can crash the Unbound DNS resolver daemon by sending malformed NSEC3 responses, 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
- Available
What is CVE-2011-4869?
CVE-2011-4869 is a high-severity denial of service vulnerability in n/a, published on 20 Dec 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
validator/val_nsec3.c in Unbound before 1.4.13p2 does not properly perform proof processing for NSEC3-signed zones, which allows remote DNS servers to cause a denial of service (daemon crash) via a malformed response that lacks expected NSEC3 records, a different vulnerability than CVE-2011-4528.
Weakness: CWE-399
Which versions are affected by CVE-2011-4869?
It affects 1 product.
Products include Unbound Unbound.
How do I fix CVE-2011-4869?
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-2011-4869 being exploited?
There is no known exploitation of CVE-2011-4869 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as DEBIAN-CVE-2011-4869, GHSA-6xqx-v8qv-h8xm.