CVE-2023-30800: MikroTik RouterOS Web Interface Heap Corruption

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-09-07 · updated 2026-06-17
Weakness: CWE-787

Description

The web server used by MikroTik RouterOS version 6 is affected by a heap memory corruption issue. A remote and unauthenticated attacker can corrupt the server's heap memory by sending a crafted HTTP request. As a result, the web interface crashes and is immediately restarted. The issue was fixed in RouterOS 6.49.10 stable. RouterOS version 7 is not affected.

Affected products

MikroTik RouterOS: from 6.0 before 6.49.10 — fixed in 6.49.10

How to fix

Upgrade to a fixed version: MikroTik RouterOS 6.49.10. Check the vendor advisory for mitigations.

References

https://vulncheck.com/advisories/mikrotik-jsproxy-dos
https://vulncheck.com/advisories/mikrotik-jsproxy-dos

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