# CVE-2021-45039: Memory corruption in n/a

> Remote attackers can exploit a buffer overflow in an undocumented UDP service to execute code and gain root access via hardcoded credentials.

- **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:** 31 May 2023
- **Updated:** 10 Jan 2025
- **Also known as:** GHSA-x4x8-9gcf-h58w

## What is CVE-2021-45039?

CVE-2021-45039 is a critical memory corruption vulnerability in n/a, published on 31 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Multiple models of the Uniview IP Camera (e.g., IPC_G6103 B6103.16.10.B25.201218, IPC_G61, IPC21, IPC23, IPC32, IPC36, IPC62, and IPC_HCMN) offer an undocumented UDP service on port 7788 that allows a remote unauthenticated attacker to overflow an internal buffer and achieve code execution. By using this buffer overflow, a remote attacker can start the telnetd service. This service has a hardcoded default username and password (root/123456). Although it has a restrictive shell, this can be easily bypassed via the built-in ECHO shell command.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2021-45039?

It affects 1 product.


Products: Uniview Camera Firmware.

## How do I fix CVE-2021-45039?

No fix has been published for CVE-2021-45039 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-45039 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-45039 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-45039 and fix it if it is affected.

What it is: CVE-2021-45039 is a critical memory corruption vulnerability in n/a, published on 31 May 2023. 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-2021-45039 exists.

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-2021-45039/ (Markdown: https://insights.sbomify.com/CVE-2021-45039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45039
- OSV: https://osv.dev/vulnerability/CVE-2021-45039

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45039/
Summaries are generated and may contain mistakes; the official description above is the record.