# CVE-2021-40008: Denial of service in CloudEngine 12800;CloudEngine 5800;CloudEngine 6800;CloudEngine 7800

> Attackers can cause memory exhaustion and denial of service on Huawei CloudEngine switches by sending crafted binary messages.

- **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:** 13 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-2c7w-qmwm-xgjp

## What is CVE-2021-40008?

CVE-2021-40008 is a high-severity denial of service vulnerability in CloudEngine 12800;CloudEngine 5800;CloudEngine 6800;CloudEngine 7800, published on 13 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

There is a memory leak vulnerability in CloudEngine 12800 V200R019C00SPC800, CloudEngine 5800 V200R019C00SPC800, CloudEngine 6800 V200R019C00SPC800 and CloudEngine 7800 V200R019C00SPC800. The software does not sufficiently track and release allocated memory while parse a series of crafted binary messages, which could consume remaining memory. Successful exploit could cause memory exhaust.

Weakness: CWE-772 (Missing Release of Resource after Effective Lifetime)

## Which versions are affected by CVE-2021-40008?

It affects 4 products.


Products: Huawei Cloudengine 12800 Firmware, Huawei Cloudengine 5800 Firmware, Huawei Cloudengine 6800 Firmware, Huawei Cloudengine 7800 Firmware.

## How do I fix CVE-2021-40008?

No fix has been published for CVE-2021-40008 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-40008 being exploited?

There is no known exploitation of CVE-2021-40008 in the wild and no public exploit code.

## Other vulnerabilities in CloudEngine 12800;CloudEngine 5800;CloudEngine 6800;CloudEngine 7800

- [CVE-2016-6178](https://insights.sbomify.com/CVE-2016-6178/): Other in n/a (critical 9.8)
- [CVE-2020-9207](https://insights.sbomify.com/CVE-2020-9207/): Auth bypass in CloudEngine 12800 (high 7.8)
- [CVE-2021-22328](https://insights.sbomify.com/CVE-2021-22328/): Denial of service in CloudEngine 12800;CloudEngine 5800;CloudEngine 6800;CloudEngine 7800 (high 7.5)
- [CVE-2021-22332](https://insights.sbomify.com/CVE-2021-22332/): Use after free in CloudEngine 12800;CloudEngine 5800;CloudEngine 6800;CloudEngine 7800 (high 7.5)
- [CVE-2021-22393](https://insights.sbomify.com/CVE-2021-22393/): Denial of service in CloudEngine 12800;CloudEngine 5800;CloudEngine 6800;CloudEngine 7800 (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-40008 and fix it if it is affected.

What it is: CVE-2021-40008 is a high-severity denial of service vulnerability in CloudEngine 12800;CloudEngine 5800;CloudEngine 6800;CloudEngine 7800, published on 13 Dec 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-2021-40008 in the wild and no public exploit code.

Affected product: CloudEngine 12800;CloudEngine 5800;CloudEngine 6800;CloudEngine 7800. 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-2021-40008/ (Markdown: https://insights.sbomify.com/CVE-2021-40008/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-40008
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-40008
- OSV: https://osv.dev/vulnerability/CVE-2021-40008

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-40008/
Summaries are generated and may contain mistakes; the official description above is the record.