CVE-2011-10020 Kaillera 0.86 Server DoS via Malformed UDP Packet
Unauthenticated remote attackers can crash the Kaillera server by sending malformed UDP packets after the initial handshake, causing service disruption.
- 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-2011-10020?
CVE-2011-10020 is a high-severity denial of service vulnerability in Kaillera Project Server, published on 20 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Kaillera Server version 0.86 is vulnerable to a denial-of-service condition triggered by sending a malformed UDP packet after the initial handshake. Once a client sends a valid HELLO0.83 packet and receives a response, any subsequent malformed packet causes the server to crash and become unresponsive. This flaw stems from improper input validation in the server’s UDP packet handler, allowing unauthenticated remote attackers to disrupt service availability.
Weakness: CWE-20
Which versions are affected by CVE-2011-10020?
How do I fix CVE-2011-10020?
No fix has been published for CVE-2011-10020 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-2011-10020 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2011-10020 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-r56f-c7p9-h5jg.