# CVE-2021-25849: Integer overflow in n/a

> An integer underflow in Moxa IP Cameras allows remote attackers to cause a denial of service via crafted LLDP packets.

- **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-vwhr-cxjh-7vpw

## What is CVE-2021-25849?

CVE-2021-25849 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

An integer underflow was discovered in userdisk/vport_lldpd in Moxa Camera VPort 06EC-2V Series, version 1.1, improper validation of the PortID TLV leads to Denial of Service via a crafted lldp packet.

Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2021-25849?

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-2021-25849?

No fix has been published for CVE-2021-25849 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-25849 being exploited?

There is no known exploitation of CVE-2021-25849 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-2021-25845](https://insights.sbomify.com/CVE-2021-25845/): Null dereference in n/a (high 7.5)
- [CVE-2021-25846](https://insights.sbomify.com/CVE-2021-25846/): Integer overflow in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-25849 and fix it if it is affected.

What it is: CVE-2021-25849 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-2021-25849 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-2021-25849/ (Markdown: https://insights.sbomify.com/CVE-2021-25849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-25849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-25849
- OSV: https://osv.dev/vulnerability/CVE-2021-25849

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-25849/
Summaries are generated and may contain mistakes; the official description above is the record.