# CVE-2020-4099: HCL Verse for Android is susceptible to an APK signing key check vulnerability

> Attackers can forge digital signatures to distribute maliciously modified versions of the HCL Verse Android application due to weak signing keys.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Nov 2022
- **Updated:** 2 May 2025
- **Also known as:** GHSA-pc4m-vcwh-9c5h

## What is CVE-2020-4099?

CVE-2020-4099 is a medium-severity vulnerability in HCL Verse for Android, published on 1 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The application was signed using a key length less than or equal to 1024 bits, making it potentially vulnerable to forged digital signatures. An attacker could forge the same digital signature of the app after maliciously modifying the app.

Weakness: CWE-326 (Inadequate Encryption Strength)

## Which versions are affected by CVE-2020-4099?

It affects 1 product.


Products: Hcltech Verse.

## How do I fix CVE-2020-4099?

No fix has been published for CVE-2020-4099 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-4099 being exploited?

There is no known exploitation of CVE-2020-4099 in the wild and no public exploit code.

## Other vulnerabilities in HCL Verse for Android

- [CVE-2023-37496](https://insights.sbomify.com/CVE-2023-37496/): HCL Verse is susceptible to a Stored Cross-Site Scripting (XSS) Vulnerability (high 8.3)
- [CVE-2021-27788](https://insights.sbomify.com/CVE-2021-27788/): HCL Verse is susceptible to a Cross Site Scripting (XSS) vulnerability (high 8.3)
- [CVE-2023-28013](https://insights.sbomify.com/CVE-2023-28013/): HCL Verse is susceptible to a Reflected Cross-Site Scripting (XSS) Vulnerability (medium 6.5)
- [CVE-2021-27768](https://insights.sbomify.com/CVE-2021-27768/): An SSL certificate host verification vulnerability affects HCL Verse for Android (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-4099 and fix it if it is affected.

What it is: CVE-2020-4099 is a medium-severity vulnerability in HCL Verse for Android, published on 1 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-2020-4099 in the wild and no public exploit code.

Affected product: HCL Verse for Android. 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-2020-4099/ (Markdown: https://insights.sbomify.com/CVE-2020-4099/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-4099
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4099
- OSV: https://osv.dev/vulnerability/CVE-2020-4099

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-4099/
Summaries are generated and may contain mistakes; the official description above is the record.