# CVE-2016-1000005: Other in n/a

> Type confusion in mcrypt_get_block_size allows attackers to cause denial of service by passing non-string data.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Feb 2020
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-8jmq-q75q-rmj9, UBUNTU-CVE-2016-1000005

## What is CVE-2016-1000005?

CVE-2016-1000005 is a critical vulnerability in n/a, published on 19 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

mcrypt_get_block_size did not enforce that the provided "module" parameter was a string, leading to type confusion if other types of data were passed in. This issue affects HHVM versions prior to 3.9.5, all versions between 3.10.0 and 3.12.3 (inclusive), and all versions between 3.13.0 and 3.14.1 (inclusive).

Weakness: CWE-843 (Access of Resource Using Incompatible Type)

## Which versions are affected by CVE-2016-1000005?

It affects 1 product.


Products: Facebook Hhvm.

## How do I fix CVE-2016-1000005?

No fix has been published for CVE-2016-1000005 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-1000005 being exploited?

There is no known exploitation of CVE-2016-1000005 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-36937](https://insights.sbomify.com/CVE-2022-36937/): HHVM 4.172.0 and all prior versions use TLS 1.0 for secure connections when handling tls:// URLs in the stream extension. (critical 9.8)
- [CVE-2020-1900](https://insights.sbomify.com/CVE-2020-1900/): Use after free in HHVM (critical 9.8)
- [CVE-2020-1916](https://insights.sbomify.com/CVE-2020-1916/): Integer overflow in HHVM (critical 9.8)
- [CVE-2020-1917](https://insights.sbomify.com/CVE-2020-1917/): Memory corruption in HHVM (critical 9.8)
- [CVE-2021-24025](https://insights.sbomify.com/CVE-2021-24025/): Integer overflow in HHVM (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-1000005 and fix it if it is affected.

What it is: CVE-2016-1000005 is a critical vulnerability in n/a, published on 19 Feb 2020. 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-2016-1000005 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-2016-1000005/ (Markdown: https://insights.sbomify.com/CVE-2016-1000005/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-1000005
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-1000005
- OSV: https://osv.dev/vulnerability/CVE-2016-1000005

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-1000005/
Summaries are generated and may contain mistakes; the official description above is the record.