# CVE-2021-33317: Null dereference in n/a

> An attacker can crash the LLDP process on TRENDnet TI-PG1284i switches by sending a crafted packet, causing a denial of service.

- **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:** 11 May 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-mp5j-gcgv-qr44

## What is CVE-2021-33317?

CVE-2021-33317 is a high-severity vulnerability in n/a, published on 11 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The TRENDnet TI-PG1284i switch(hw v2.0R) prior to version 2.0.2.S0 suffers from a null pointer dereference vulnerability. This vulnerability exists in its lldp related component. Due to fail to check if ChassisID TLV is contained in the packet, by sending a crafted lldp packet to the device, an attacker can crash the process due to null pointer dereference.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2021-33317?

It affects 9 products.


Products: Trendnet Teg-30102ws Firmware, Trendnet Ti-G102i Firmware, Trendnet Ti-G160i Firmware, Trendnet Ti-G642i Firmware, Trendnet Ti-Pg102i Firmware, Trendnet Ti-Pg1284i Firmware, Trendnet Ti-Pg541i Firmware, Trendnet Ti-Rp262i Firmware, Trendnet Tpe-30102ws Firmware.

## How do I fix CVE-2021-33317?

No fix has been published for CVE-2021-33317 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33317 being exploited?

There is no known exploitation of CVE-2021-33317 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-33315](https://insights.sbomify.com/CVE-2021-33315/): Integer overflow in n/a (critical 9.8)
- [CVE-2021-33316](https://insights.sbomify.com/CVE-2021-33316/): Integer overflow in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33317 and fix it if it is affected.

What it is: CVE-2021-33317 is a high-severity vulnerability in n/a, published on 11 May 2022. 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-2021-33317 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-2021-33317/ (Markdown: https://insights.sbomify.com/CVE-2021-33317/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33317
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33317
- OSV: https://osv.dev/vulnerability/CVE-2021-33317

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33317/
Summaries are generated and may contain mistakes; the official description above is the record.