HOMEVULNERABILITIESCVE-2021-22156
CRITICAL

CVE-2021-22156

CWE-190Published: August 17, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

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.

NVD Source

Technical Analysis

CVE-2021-22156 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

blackberry3 product(s)
qnx software development platformqnx os for medicalqnx os for safety
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://support.blackberry.com/kb/articleDetail?articleNumber=000082334
PATCHhttps://support.blackberry.com/kb/articleDetail?articleNumber=000082334
ADVISORYhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-qnx-TOxjVPdL
ADVISORYhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-qnx-TOxjVPdL

All References (4)

→
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

Quick Facts

CVE IDCVE-2021-22156
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-190
CISA KEVNo
Affected1 vendor(s)
PublishedAug 17, 2021

Related CVEs (CWE-190)

CVE-2012-5835
10.0
CVE-2015-5097
10.0
CVE-2008-2663
10.0
CVE-2010-1233
10.0
CVE-2013-2555
10.0
CVE-2015-5108
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-22156 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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