# CVE-2021-31796: Weak cryptography in n/a

> Weak encryption in CyberArk Credential Provider allows attackers to decrypt credential files due to low key entropy, leading to information disclosure.

- **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:** 2 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-75qm-m8r5-4ccg

## What is CVE-2021-31796?

CVE-2021-31796 is a high-severity vulnerability in n/a, published on 2 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An inadequate encryption vulnerability discovered in CyberArk Credential Provider before 12.1 may lead to Information Disclosure. An attacker may realistically have enough information that the number of possible keys (for a credential file) is only one, and the number is usually not higher than 2^36.

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

## Which versions are affected by CVE-2021-31796?

It affects 1 product.


Products: Cyberark Credential Provider.

## How do I fix CVE-2021-31796?

No fix has been published for CVE-2021-31796 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31796 being exploited?

There is no known exploitation of CVE-2021-31796 in the wild and no public exploit code.

Public exploit code:

- C-Ark Credential Decoder for #CVE-2021-31796 (github_poc): https://github.com/unmanarc/CACredDecoder

## Other vulnerabilities in n/a

- [CVE-2021-31797](https://insights.sbomify.com/CVE-2021-31797/): The user identification mechanism used by CyberArk Credential Provider prior to 12.1 is susceptible to a local host race condition, leading (medium 5.1)
- [CVE-2021-31798](https://insights.sbomify.com/CVE-2021-31798/): Weak cryptography in n/a (medium 4.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31796 and fix it if it is affected.

What it is: CVE-2021-31796 is a high-severity vulnerability in n/a, published on 2 Sep 2021. 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-2021-31796 in the wild and no public exploit code.

Affected product: n/a. 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-2021-31796/ (Markdown: https://insights.sbomify.com/CVE-2021-31796/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31796
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31796
- OSV: https://osv.dev/vulnerability/CVE-2021-31796

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31796/
Summaries are generated and may contain mistakes; the official description above is the record.