# CVE-2021-3942: Memory corruption in HP Print products and Digital Sending products

> Remote attackers can execute arbitrary code on HP Print and Digital Sending products via a buffer overflow in LLMNR handling.

- **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:** 22 Nov 2022
- **Updated:** 25 Apr 2025
- **Also known as:** GHSA-57f3-4qgr-hcrw

## What is CVE-2021-3942?

CVE-2021-3942 is a critical memory corruption vulnerability in HP Print products and Digital Sending products, published on 22 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Certain HP Print products and Digital Sending products may be vulnerable to potential remote code execution and buffer overflow with use of Link-Local Multicast Name Resolution or LLMNR.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2021-3942?

It affects 2700 products.


Products: Hp Color Laserjet Cm4540 Mfp Cc419a Firmware, Hp Color Laserjet Cm4540 Mfp Cc420a Firmware, Hp Color Laserjet Cm4540 Mfp Cc421a Firmware, Hp Color Laserjet Cm5525 Mfp Ce707a Firmware, Hp Color Laserjet Cm5525 Mfp Ce708a Firmware, Hp Color Laserjet Cm5525 Mfp Ce709a Firmware, Hp Color Laserjet Enterprise Flow Mfp M577 B5l46a Firmware, Hp Color Laserjet Enterprise Flow Mfp M577 B5l47a Firmware, Hp Color Laserjet Enterprise Flow Mfp M577 B5l48a Firmware, Hp Color Laserjet Enterprise Flow Mfp M577 B5l54a Firmware, Hp Color Laserjet Enterprise Flow Mfp M680 Ca251a Firmware, Hp Color Laserjet Enterprise Flow Mfp M680 Cz248a Firmware, Hp Color Laserjet Enterprise Flow Mfp M680 Cz249a Firmware, Hp Color Laserjet Enterprise Flow Mfp M680 Cz250a Firmware, Hp Color Laserjet Enterprise Flow Mfp M681 J8a10a Firmware, Hp Color Laserjet Enterprise Flow Mfp M681 J8a11a Firmware, Hp Color Laserjet Enterprise Flow Mfp M681 J8a12a Firmware, Hp Color Laserjet Enterprise Flow Mfp M681 J8a13a Firmware, Hp Color Laserjet Enterprise Flow Mfp M682 J8a16a Firmware, Hp Color Laserjet Enterprise Flow Mfp M682 J8a17a Firmware and 2680 more.

## How do I fix CVE-2021-3942?

No fix has been published for CVE-2021-3942 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-3942 being exploited?

There is no known exploitation of CVE-2021-3942 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3942 and fix it if it is affected.

What it is: CVE-2021-3942 is a critical memory corruption vulnerability in HP Print products and Digital Sending products, published on 22 Nov 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-2021-3942 in the wild and no public exploit code.

Affected product: HP Print products and Digital Sending products. 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-2021-3942/ (Markdown: https://insights.sbomify.com/CVE-2021-3942/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3942
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3942
- OSV: https://osv.dev/vulnerability/CVE-2021-3942

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3942/
Summaries are generated and may contain mistakes; the official description above is the record.