CVE-2021-22156

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.

Exploit odds

1.8% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-08-17 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:36 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.8% in the next 30 days (EPSS).
• Severity: 9.0 CRITICAL (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-08-17 19:15 UTC

Last modified

2026-06-17 03:36 UTC

Exploit probability

1.8% · EPSS, next 30 days

Weakness

CWE-190 · Integer overflow

Record status

Modified

Affected

• Blackberry Qnx Software Development Platform < 6.5.0
• Blackberry Qnx Software Development Platform 6.5.0
• Blackberry Qnx Os For Medical ≤ 1.1.1
• Blackberry Qnx Os For Safety ≤ 1.0.2

Attack profile CVSS 3.1 · 9.0

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-22156.md and follow it. Check whether this project is affected by CVE-2021-22156. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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