# CVE-2021-27756: Weak cryptography in "BigFix Compliance Server"

> Attackers can decrypt recorded traffic if TLS-RSA ciphers are enabled and secure ciphers are not configured in BigFix Compliance Server.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:** 4 Mar 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-gh5q-rh5p-wvqr

## What is CVE-2021-27756?

CVE-2021-27756 is a high-severity vulnerability in "BigFix Compliance Server", published on 4 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

"TLS-RSA cipher suites are not disabled in BigFix Compliance up to v2.0.5. If TLS 2.0 and secure ciphers are not enabled then an attacker can passively record traffic and later decrypt it."

Weakness: CWE-327 (Use of a Broken or Risky Cryptographic Algorithm)

## Which versions are affected by CVE-2021-27756?

It affects 1 product.


Products: Hcltech Bigfix Compliance.

## How do I fix CVE-2021-27756?

No fix has been published for CVE-2021-27756 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27756 being exploited?

There is no known exploitation of CVE-2021-27756 in the wild and no public exploit code.

## Other vulnerabilities in "BigFix Compliance Server"

- [CVE-2024-30125](https://insights.sbomify.com/CVE-2024-30125/): HCL BigFix Compliance is affected by an internal server error (medium 6.2)
- [CVE-2024-42212](https://insights.sbomify.com/CVE-2024-42212/): HCL BigFix Compliance is affected by an improper or missing SameSite attribute (medium 5.4)
- [CVE-2024-30140](https://insights.sbomify.com/CVE-2024-30140/): HCL BigFix Compliance is affected by unvalidated redirects and forwards (medium 5.4)
- [CVE-2023-37525](https://insights.sbomify.com/CVE-2023-37525/): HCL BigFix Compliance is vulnerable to a sensitive information disclosure (medium 5.3)
- [CVE-2024-42213](https://insights.sbomify.com/CVE-2024-42213/): HCL BigFix Compliance is affected by inclusion of temporary files left in the production environment (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27756 and fix it if it is affected.

What it is: CVE-2021-27756 is a high-severity vulnerability in "BigFix Compliance Server", published on 4 Mar 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-2021-27756 in the wild and no public exploit code.

Affected product: "BigFix Compliance Server". 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-2021-27756/ (Markdown: https://insights.sbomify.com/CVE-2021-27756/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27756
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27756
- OSV: https://osv.dev/vulnerability/CVE-2021-27756

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27756/
Summaries are generated and may contain mistakes; the official description above is the record.