# CVE-2017-20149: Memory corruption in n/a

> Remote unauthenticated attackers can execute arbitrary code on Mikrotik RouterOS devices via crafted HTTP requests due to memory corruption.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Oct 2022
- **Updated:** 14 May 2025
- **Also known as:** GHSA-qjvr-7h9f-927v

## What is CVE-2017-20149?

CVE-2017-20149 is a critical memory corruption vulnerability in Mikrotik Routeros, published on 15 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Mikrotik RouterOS web server allows memory corruption in releases before Stable 6.38.5 and Long-term 6.37.5, aka Chimay-Red. A remote and unauthenticated user can trigger the vulnerability by sending a crafted HTTP request. An attacker can use this vulnerability to execute arbitrary code on the affected system, as exploited in the wild in mid-2017 and later.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2017-20149?

It affects 1 product.


Products: Mikrotik Routeros.

## How do I fix CVE-2017-20149?

No fix has been published for CVE-2017-20149 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-20149 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20149 exists.

## Other vulnerabilities in Mikrotik Routeros

- [CVE-2018-7445](https://insights.sbomify.com/CVE-2018-7445/): MikroTik RouterOS Stack-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2026-86060](https://insights.sbomify.com/CVE-2026-86060/): MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command (critical 9.2, exploited in the wild)
- [CVE-2018-14847](https://insights.sbomify.com/CVE-2018-14847/): MikroTik Router OS Directory Traversal (critical 9.1, exploited in the wild)
- [CVE-2026-67277](https://insights.sbomify.com/CVE-2026-67277/): MikroTik RouterOS Missing Authentication for Critical Function (high 8.8, exploited in the wild)
- [CVE-2026-67279](https://insights.sbomify.com/CVE-2026-67279/): Mikrotik RouterOS Improper Enforcement of Behavioral Workflow (medium 6.9, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-20149 and fix it if it is affected.

What it is: CVE-2017-20149 is a critical memory corruption vulnerability in Mikrotik Routeros, published on 15 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20149 exists.

Affected product: Mikrotik Routeros. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2017-20149/ (Markdown: https://insights.sbomify.com/CVE-2017-20149/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-20149
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-20149
- OSV: https://osv.dev/vulnerability/CVE-2017-20149

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-20149/
Summaries are generated and may contain mistakes; the official description above is the record.