CVE-2021-22156

Name: CVE-2021-22156
Creator: NVD / NIST
Published: 2021-08-17T19:15:08.057+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.80%

Last modified Jun 17, 2026

CVE-2021-22156 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.80% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.80%

75.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
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

References

https://support.blackberry.com/kb/articleDetail?articleNumber=000082334Patch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-qnx-TOxjVPdLThird Party Advisory
https://support.blackberry.com/kb/articleDetail?articleNumber=000082334Patch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-qnx-TOxjVPdLThird Party Advisory

Timeline

Published: Aug 17, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-22156?

How severe is CVE-2021-22156?

CVE-2021-22156 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.80% probability of exploitation in the next 30 days.

How do I fix CVE-2021-22156?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22156?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST