# CVE-2018-8879: Memory corruption in n/a

> Remote attackers can execute arbitrary code on ASUS routers via a stack-based buffer overflow in the blocking.asp page.

- **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:** 21 Nov 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-8c78-mq7w-pq49

## What is CVE-2018-8879?

CVE-2018-8879 is a critical memory corruption vulnerability in n/a, published on 21 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Stack-based buffer overflow in Asuswrt-Merlin firmware for ASUS devices older than 384.4 and ASUS firmware before 3.0.0.4.382.50470 for devices allows remote attackers to execute arbitrary code by providing a long string to the blocking.asp page via a GET or POST request. Vulnerable parameters are flag, mac, and cat_id.

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

## Which versions are affected by CVE-2018-8879?

It affects 1 product.


Products: Asus Rt-Ac66u Firmware.

## How do I fix CVE-2018-8879?

No fix has been published for CVE-2018-8879 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-8879 being exploited?

There is no known exploitation of CVE-2018-8879 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2013-6343](https://insights.sbomify.com/CVE-2013-6343/): Memory corruption in n/a (critical 10.0)
- [CVE-2013-4656](https://insights.sbomify.com/CVE-2013-4656/): Path traversal in n/a (critical 9.8)
- [CVE-2013-4659](https://insights.sbomify.com/CVE-2013-4659/): Memory corruption in n/a (critical 9.8)
- [CVE-2014-2719](https://insights.sbomify.com/CVE-2014-2719/): Information disclosure in n/a (medium 6.3)
- [CVE-2020-7997](https://insights.sbomify.com/CVE-2020-7997/): Cross-site scripting in n/a (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-8879 and fix it if it is affected.

What it is: CVE-2018-8879 is a critical memory corruption vulnerability in n/a, published on 21 Nov 2019. 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-2018-8879 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-2018-8879/ (Markdown: https://insights.sbomify.com/CVE-2018-8879/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-8879
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-8879
- OSV: https://osv.dev/vulnerability/CVE-2018-8879

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-8879/
Summaries are generated and may contain mistakes; the official description above is the record.