# CVE-2021-27782: HCL BigFix Mobile / Modern Client Management Server passwords are susceptible to a brute-force attack

> Attackers can brute-force admin passwords due to missing lockout mechanisms, potentially gaining unauthorized access to the management interface.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Jan 2023
- **Updated:** 2 Apr 2025
- **Also known as:** GHSA-93v4-p5mh-4hr7

## What is CVE-2021-27782?

CVE-2021-27782 is a medium-severity vulnerability in HCL Software BigFix Mobile, published on 19 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

HCL BigFix Mobile / Modern Client Management Admin and Config UI passwords can be brute-forced.
User should be locked out for multiple invalid attempts.

Weakness: CWE-307 (Improper Restriction of Excessive Authentication Attempts)

## Which versions are affected by CVE-2021-27782?

It affects 1 product.


Products: Hcltech Bigfix Mobile.

## How do I fix CVE-2021-27782?

No fix has been published for CVE-2021-27782 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27782 being exploited?

There is no known exploitation of CVE-2021-27782 in the wild and no public exploit code.

## Other vulnerabilities in HCL Software BigFix Mobile

- [CVE-2021-27783](https://insights.sbomify.com/CVE-2021-27783/): HCL BigFix Mobile / Modern Client Management is vulnerable to sensitive information exposure (medium 6.8)
- [CVE-2023-28014](https://insights.sbomify.com/CVE-2023-28014/): HCL BigFix Mobile can be affected by a cross-site scripting (XSS) vulnerability (medium 6.6)
- [CVE-2021-27781](https://insights.sbomify.com/CVE-2021-27781/): HCL BigFix Mobile / Modern Client Management is vulnerable to stored cross-site scripting (medium 6.6)
- [CVE-2025-0276](https://insights.sbomify.com/CVE-2025-0276/): HCL BigFix Modern Client Management (MCM) is affected by an insecure Content Security Policy (CSP) (medium 6.5)
- [CVE-2025-0277](https://insights.sbomify.com/CVE-2025-0277/): HCL BigFix Mobile is affected by an insecure Content Security Policy (CSP) (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27782 and fix it if it is affected.

What it is: CVE-2021-27782 is a medium-severity vulnerability in HCL Software BigFix Mobile, published on 19 Jan 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-27782 in the wild and no public exploit code.

Affected product: HCL Software BigFix Mobile. 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-2021-27782/ (Markdown: https://insights.sbomify.com/CVE-2021-27782/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27782
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27782
- OSV: https://osv.dev/vulnerability/CVE-2021-27782

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27782/
Summaries are generated and may contain mistakes; the official description above is the record.