# CVE-2017-18046: Memory corruption in n/a

> Remote attackers can execute arbitrary code on Dasan GPON ONT WiFi Routers via a buffer overflow in the login CGI script.

- **Severity:** Critical 9.8 (`CVSS:3.0/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:** 21 Jan 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-grjw-qj2p-c4f5

## What is CVE-2017-18046?

CVE-2017-18046 is a critical memory corruption vulnerability in n/a, published on 21 Jan 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Buffer overflow on Dasan GPON ONT WiFi Router H640X 12.02-01121 2.77p1-1124 and 3.03p2-1146 devices allows remote attackers to execute arbitrary code via a long POST request to the login_action function in /cgi-bin/login_action.cgi (aka cgipage.cgi).

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2017-18046?

It affects 1 product.


Products: Dasannetworks H640x Firmware.

## How do I fix CVE-2017-18046?

No fix has been published for CVE-2017-18046 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-18046 being exploited?

There is no known exploitation of CVE-2017-18046 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-18046 and fix it if it is affected.

What it is: CVE-2017-18046 is a critical memory corruption vulnerability in n/a, published on 21 Jan 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-18046 in the wild and no public exploit code.

Affected product: n/a. 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-2017-18046/ (Markdown: https://insights.sbomify.com/CVE-2017-18046/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-18046
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-18046
- OSV: https://osv.dev/vulnerability/CVE-2017-18046

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-18046/
Summaries are generated and may contain mistakes; the official description above is the record.