CVE-2019-3924 Server-side request forgery in MikroTik RouterOS
Remote attackers can exploit an intermediary vulnerability to bypass firewalls and scan networks by forcing the router to execute arbitrary network requests.
- 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-2019-3924?
CVE-2019-3924 is a high-severity server-side request forgery vulnerability in Mikrotik Routeros, published on 20 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability. The software will execute user defined network requests to both WAN and LAN clients. A remote unauthenticated attacker can use this vulnerability to bypass the router's firewall or for general network scanning activities.
Weakness: CWE-441
Which versions are affected by CVE-2019-3924?
It affects 1 product.
Products include Mikrotik Routeros.
How do I fix CVE-2019-3924?
No fix has been published for CVE-2019-3924 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2019-3924 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-3924 exists.
Public exploit code: 1 Exploit-DB entry.
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-4qcw-5w3m-2hfg.