# CVE-2021-29998: Memory corruption in n/a

> A heap overflow in the VxWorks DHCP client allows attackers to execute arbitrary code or cause a denial of service.

- **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:** 13 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-hpxq-hffh-gxv5

## What is CVE-2021-29998?

CVE-2021-29998 is a critical memory corruption vulnerability in n/a, published on 13 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Wind River VxWorks before 6.5. There is a possible heap overflow in dhcp client.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2021-29998?

It affects 36 products.


Products: Siemens Ruggedcom Win Subscriber Station Firmware, Siemens Scalance X200-4 P Irt Firmware, Siemens Scalance X201-3p Irt Firmware, Siemens Scalance X201-3p Irt Pro Firmware, Siemens Scalance X202-2 Irt Firmware, Siemens Scalance X202-2p Irt Firmware, Siemens Scalance X202-2p Irt Pro Firmware, Siemens Scalance X204-2 Firmware, Siemens Scalance X204-2fm Firmware, Siemens Scalance X204-2ld Firmware, Siemens Scalance X204-2ld Ts Firmware, Siemens Scalance X204-2ts Firmware, Siemens Scalance X204 Irt Firmware, Siemens Scalance X204 Irt Pro Firmware, Siemens Scalance X206-1 Firmware, Siemens Scalance X206-1ld Firmware, Siemens Scalance X208 Firmware, Siemens Scalance X208 Pro Firmware, Siemens Scalance X212-2 Firmware, Siemens Scalance X212-2ld Firmware and 16 more.

## How do I fix CVE-2021-29998?

No fix has been published for CVE-2021-29998 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-29998 being exploited?

There is no known exploitation of CVE-2021-29998 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-29998 and fix it if it is affected.

What it is: CVE-2021-29998 is a critical memory corruption vulnerability in n/a, published on 13 Apr 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-2021-29998 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-2021-29998/ (Markdown: https://insights.sbomify.com/CVE-2021-29998/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-29998
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-29998
- OSV: https://osv.dev/vulnerability/CVE-2021-29998

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-29998/
Summaries are generated and may contain mistakes; the official description above is the record.