# CVE-2020-4102: Memory corruption in HCL Notes

> A buffer overflow in HCL Notes DXL allows attackers to execute arbitrary code or crash the client application.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Dec 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-qrxp-3jr9-xcc9

## What is CVE-2020-4102?

CVE-2020-4102 is a medium-severity memory corruption vulnerability in HCL Notes, published on 2 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

HCL Notes is susceptible to a Buffer Overflow vulnerability in DXL due to improper validation of user input. A successful exploit could enable an attacker to crash Notes or execute attacker-controlled code on the client system.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2020-4102?

It affects 1 product.


Products: Hcltech Notes.

## How do I fix CVE-2020-4102?

No fix has been published for CVE-2020-4102 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-4102 being exploited?

There is no known exploitation of CVE-2020-4102 in the wild and no public exploit code.

## Other vulnerabilities in HCL Notes

- [CVE-2022-44751](https://insights.sbomify.com/CVE-2022-44751/): HCL Notes is susceptible to a stack based buffer overflow vulnerability in lasr.dll in Micro Focus KeyView (critical 9.8)
- [CVE-2022-44753](https://insights.sbomify.com/CVE-2022-44753/): HCL Notes is susceptible to a stack based buffer overflow vulnerability in wp6sr.dll in Micro Focus KeyView (critical 9.8)
- [CVE-2022-44755](https://insights.sbomify.com/CVE-2022-44755/): HCL Notes is susceptible to a stack based buffer overflow vulnerability in lasr.dll in Micro Focus KeyView (critical 9.8)
- [CVE-2020-14224](https://insights.sbomify.com/CVE-2020-14224/): Memory corruption in HCL Notes (critical 9.8)
- [CVE-2020-14268](https://insights.sbomify.com/CVE-2020-14268/): Memory corruption in HCL Notes (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-4102 and fix it if it is affected.

What it is: CVE-2020-4102 is a medium-severity memory corruption vulnerability in HCL Notes, published on 2 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-4102 in the wild and no public exploit code.

Affected product: HCL Notes. 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-2020-4102/ (Markdown: https://insights.sbomify.com/CVE-2020-4102/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-4102
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4102
- OSV: https://osv.dev/vulnerability/CVE-2020-4102

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-4102/
Summaries are generated and may contain mistakes; the official description above is the record.