CVE-2019-3924 — MikroTik RouterOS before 6

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

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Tenable	MikroTik RouterOS	RouterOS long-term 6.42.11 and below, RouterOS stable 6.43.11 and below

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-02-20T20:00:00.000Z
• Last modified: 2024-09-17T02:46:52.071Z

09References

• www.exploit-db.com — https://www.exploit-db.com/exploits/46444/
• www.tenable.com — https://www.tenable.com/security/research/tra-2019-07
• www.securityfocus.com — http://www.securityfocus.com/bid/107177