# CVE-2026-44089: Buffer Overflow in Totolink EX1200L router

> A buffer overflow in the login endpoint allows remote attackers to execute code with root privileges, potentially bricking the device.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jun 2026
- **Updated:** 23 Jun 2026
- **Also known as:** GHSA-7mjx-95cj-9wpm

## What is CVE-2026-44089?

CVE-2026-44089 is a critical memory corruption vulnerability in Totolink EX1200L, published on 23 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Totolink EX1200L router is vulnerable to Buffer Overflow in the login functionality in cgi-bin/cstecgi.cgi endpoint. This vulnerability could be exploited to cause the program to crash and to execute code remotely. This allows the attacker to perform actions as root including reading and editing data, as well as bricking the router.

Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 9.3.5u.6146_B20201023 but may also affect other versions.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2026-44089?


## How do I fix CVE-2026-44089?

No fix has been published for CVE-2026-44089 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-44089 being exploited?

There is no known exploitation of CVE-2026-44089 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-44089 and fix it if it is affected.

What it is: CVE-2026-44089 is a critical memory corruption vulnerability in Totolink EX1200L, published on 23 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-44089 in the wild and no public exploit code.

Affected product: Totolink EX1200L. 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-2026-44089/ (Markdown: https://insights.sbomify.com/CVE-2026-44089/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-44089
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-44089
- OSV: https://osv.dev/vulnerability/CVE-2026-44089

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-44089/
Summaries are generated and may contain mistakes; the official description above is the record.