# CVE-2021-25845: Null dereference in n/a

> Attackers can cause a denial of service on Moxa IP cameras by sending a crafted LLDP packet that triggers a NULL pointer dereference.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 10 May 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-27h4-m228-rwm7

## What is CVE-2021-25845?

CVE-2021-25845 is a high-severity vulnerability in n/a, published on 10 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper validation of the ChassisID TLV in userdisk/vport_lldpd in Moxa Camera VPort 06EC-2V Series, version 1.1, allows attackers to cause a denial of service due to a NULL pointer dereference via a crafted lldp packet.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2021-25845?

It affects 16 products.


Products: Moxa Vport 06ec-2v26m Firmware, Moxa Vport 06ec-2v36m-Ct-T Firmware, Moxa Vport 06ec-2v36m-Ct Firmware, Moxa Vport 06ec-2v36m-T Firmware, Moxa Vport 06ec-2v42m-Ct-T Firmware, Moxa Vport 06ec-2v42m-Ct Firmware, Moxa Vport 06ec-2v42m-T Firmware, Moxa Vport 06ec-2v42m Firmware, Moxa Vport 06ec-2v60m-Ct-T Firmware, Moxa Vport 06ec-2v60m-Ct Firmware, Moxa Vport 06ec-2v60m-T Firmware, Moxa Vport 06ec-2v60m Firmware, Moxa Vport 06ec-2v80m-Ct-T Firmware, Moxa Vport 06ec-2v80m-Ct Firmware, Moxa Vport 06ec-2v80m-T Firmware, Moxa Vport 06ec-2v80m Firmware.

## How do I fix CVE-2021-25845?

No fix has been published for CVE-2021-25845 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-25845 being exploited?

There is no known exploitation of CVE-2021-25845 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-25847](https://insights.sbomify.com/CVE-2021-25847/): Information disclosure in n/a (critical 9.1)
- [CVE-2021-25848](https://insights.sbomify.com/CVE-2021-25848/): Information disclosure in n/a (critical 9.1)
- [CVE-2021-25846](https://insights.sbomify.com/CVE-2021-25846/): Integer overflow in n/a (high 7.5)
- [CVE-2021-25849](https://insights.sbomify.com/CVE-2021-25849/): Integer overflow in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25845 and fix it if it is affected.

What it is: CVE-2021-25845 is a high-severity vulnerability in n/a, published on 10 May 2021. 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-2021-25845 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-2021-25845/ (Markdown: https://insights.sbomify.com/CVE-2021-25845/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25845
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25845
- OSV: https://osv.dev/vulnerability/CVE-2021-25845

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25845/
Summaries are generated and may contain mistakes; the official description above is the record.