# CVE-2021-22156: Integer overflow in QNX Software Development Platform (SDP), QNX OS for Medical and QNX OS for Safety

> An integer overflow in the QNX C runtime library allows attackers to execute arbitrary code or cause denial of service.

- **Severity:** Critical 9.0 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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:** 17 Aug 2021
- **Updated:** 22 Aug 2025
- **Also known as:** GHSA-x456-hhph-f575

## What is CVE-2021-22156?

CVE-2021-22156 is a critical vulnerability in BlackBerry QNX Software Development Platform (SDP), QNX OS for Medical and QNX OS for Safety, published on 17 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An integer overflow vulnerability in the calloc() function of the C runtime library of affected versions of BlackBerry® QNX Software Development Platform (SDP) version(s) 6.5.0SP1 and earlier, QNX OS for Medical 1.1 and earlier, and QNX OS for Safety 1.0.1 and earlier that could allow an attacker to potentially perform a denial of service or execute arbitrary code.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2021-22156?

It affects 3 products.


Products: Blackberry Qnx Os for Medical, Blackberry Qnx Os for Safety, Blackberry Qnx Software Development Platform.

## How do I fix CVE-2021-22156?

No fix has been published for CVE-2021-22156 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22156 being exploited?

There is no known exploitation of CVE-2021-22156 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22156 and fix it if it is affected.

What it is: CVE-2021-22156 is a critical vulnerability in BlackBerry QNX Software Development Platform (SDP), QNX OS for Medical and QNX OS for Safety, published on 17 Aug 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-2021-22156 in the wild and no public exploit code.

Affected product: BlackBerry QNX Software Development Platform (SDP), QNX OS for Medical and QNX OS for Safety. 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-2021-22156/ (Markdown: https://insights.sbomify.com/CVE-2021-22156/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22156
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22156
- OSV: https://osv.dev/vulnerability/CVE-2021-22156

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-22156/
Summaries are generated and may contain mistakes; the official description above is the record.