CVE-2017-8338 Denial of service in n/a
Unauthenticated remote attackers can cause denial of service on MikroTik routers by flooding UDP port 500, disconnecting devices and clearing logs.
- 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-2017-8338?
CVE-2017-8338 is a high-severity denial of service vulnerability in Mikrotik Routeros, published on 18 May 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in MikroTik Version 6.38.5 could allow an unauthenticated remote attacker to exhaust all available CPU via a flood of UDP packets on port 500 (used for L2TP over IPsec), preventing the affected router from accepting new connections; all devices will be disconnected from the router and all logs removed automatically.
Weakness: CWE-400
Which versions are affected by CVE-2017-8338?
It affects 1 product.
Products include Mikrotik Routeros.
How do I fix CVE-2017-8338?
No fix has been published for CVE-2017-8338 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-2017-8338 being exploited?
There is no known exploitation of CVE-2017-8338 in the wild and no public exploit code.
Other vulnerabilities in Mikrotik Routeros
- CVE-2018-7445 MikroTik RouterOS Stack-Based Buffer Overflow
- CVE-2026-86060 MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command
- CVE-2018-14847 MikroTik Router OS Directory Traversal
- CVE-2026-67277 MikroTik RouterOS Missing Authentication for Critical Function
- CVE-2026-67279 Mikrotik RouterOS Improper Enforcement of Behavioral Workflow
Sources
Also known as GHSA-h5g4-hpfp-3289.