# CVE-2021-24027: Information disclosure in WhatsApp Business for Android

> An attacker with device storage access can read cached TLS material from WhatsApp for Android, potentially exposing sensitive communication data.

- **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:** 6 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-rr7p-xgf7-grw4

## What is CVE-2021-24027?

CVE-2021-24027 is a high-severity vulnerability in Facebook WhatsApp Business for Android, published on 6 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A cache configuration issue prior to WhatsApp for Android v2.21.4.18 and WhatsApp Business for Android v2.21.4.18 may have allowed a third party with access to the device’s external storage to read cached TLS material.

Weakness: CWE-524 (Use of Cache Containing Sensitive Information)

## Which versions are affected by CVE-2021-24027?

It affects 2 products.


Products: Whatsapp Whatsapp, Whatsapp Whatsapp Business.

## How do I fix CVE-2021-24027?

No fix has been published for CVE-2021-24027 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24027 being exploited?

There is no known exploitation of CVE-2021-24027 in the wild and no public exploit code.

Public exploit code:

- PoC and tools for exploiting CVE-2020-6516 (Chrome) and CVE-2021-24027 (WhatsApp) (github_poc): https://github.com/CENSUS/whatsapp-mitd-mitm

## Other vulnerabilities in Facebook WhatsApp Business for Android

- [CVE-2019-3568](https://insights.sbomify.com/CVE-2019-3568/): WhatsApp VOIP Stack Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2019-18426](https://insights.sbomify.com/CVE-2019-18426/): WhatsApp Cross-Site Scripting (high 8.2, exploited in the wild)
- [CVE-2025-55177](https://insights.sbomify.com/CVE-2025-55177/): Meta Platforms WhatsApp Incorrect Authorization (medium 5.4, exploited in the wild)
- [CVE-2022-36934](https://insights.sbomify.com/CVE-2022-36934/): Integer overflow in WhatsApp Business for Android (critical 9.8)
- [CVE-2021-24042](https://insights.sbomify.com/CVE-2021-24042/): Memory corruption in WhatsApp Business for Android (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24027 and fix it if it is affected.

What it is: CVE-2021-24027 is a high-severity vulnerability in Facebook WhatsApp Business for Android, published on 6 Apr 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-2021-24027 in the wild and no public exploit code.

Affected product: Facebook WhatsApp Business 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-2021-24027/ (Markdown: https://insights.sbomify.com/CVE-2021-24027/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24027
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24027
- OSV: https://osv.dev/vulnerability/CVE-2021-24027

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24027/
Summaries are generated and may contain mistakes; the official description above is the record.