# CVE-2020-0407: Weak cryptography in Android

> Truncating 64-bit IVs to 32 bits in f2fs encryption causes IV reuse, potentially leading to local information disclosure.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** A-153450752, ASB-A-153450752, GHSA-wh9w-pc8q-w744

## What is CVE-2020-0407?

CVE-2020-0407 is a medium-severity vulnerability in Google Android, published on 17 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In various functions in fscrypt_ice.c and related files in some implementations of f2fs encryption that use encryption hardware which only supports 32-bit IVs (Initialization Vectors), 64-bit IVs are used and later are truncated to 32 bits. This may cause IV reuse and thus weakened disk encryption. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-153450752References: N/A

Weakness: CWE-330 (Use of Insufficiently Random Values)

## Which versions are affected by CVE-2020-0407?

It affects 1 product.


Products: Google Android.

## How do I fix CVE-2020-0407?

Apply the vendor's patch.

## Is CVE-2020-0407 being exploited?

There is no known exploitation of CVE-2020-0407 in the wild and no public exploit code.

## Other vulnerabilities in Google Android

- [CVE-2026-58704](https://insights.sbomify.com/CVE-2026-58704/): Google Pixel Improper Authorization (high 8.8, exploited in the wild)
- [CVE-2025-48543](https://insights.sbomify.com/CVE-2025-48543/): Android Runtime Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2023-35674](https://insights.sbomify.com/CVE-2023-35674/): Android Framework Privilege Escalation (high 8.8, exploited in the wild)
- [CVE-2025-48595](https://insights.sbomify.com/CVE-2025-48595/): Android Framework Integer Overflow (high 8.4, exploited in the wild)
- [CVE-2024-32896](https://insights.sbomify.com/CVE-2024-32896/): Android Pixel Privilege Escalation (high 8.1, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-0407 and fix it if it is affected.

What it is: CVE-2020-0407 is a medium-severity vulnerability in Google Android, published on 17 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-0407 in the wild and no public exploit code.

Affected product: Google 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-2020-0407/ (Markdown: https://insights.sbomify.com/CVE-2020-0407/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-0407
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-0407
- OSV: https://osv.dev/vulnerability/CVE-2020-0407

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-0407/
Summaries are generated and may contain mistakes; the official description above is the record.