CVE-2021-22156

mediumpriority · track · 40EPSS 0.018 · 78 %ileCAEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.79% (78th) EPSS

CVSS 6.8 · medium

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No fix is available; mitigate or reduce exposure.

No fix availablecisco_csaf
No remediation is available at this time.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.8–9.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19criticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · ENISA EU

v3.19criticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · secure@blackberry.com CAexploitability 2.2 · impact 6

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-190USprimaryCWE-190US

affected products (10)

Products and version ranges known to be affected.

BlackBerry QNX Software Development Platform (SDP), QNX OS for Medical and QNX OS for Safety≤ QNX OS for Safety 1.0.1 and earlierenisa_euvdEU
BlackBerry QNX Software Development Platform (SDP), QNX OS for Medical and QNX OS for Safety≤ QNX OS for Medical 1.1 and earlierenisa_euvdEU
BlackBerry QNX Software Development Platform (SDP), QNX OS for Medical and QNX OS for Safety≤ QNX SDP 6.5.0 SP1 and earlierenisa_euvdEU
BlackBerry Limited QNX≤ 6.5.0SP1fstec_bduRU
BlackBerry Limited QNX≤ 1.1.1fstec_bduRU
BlackBerry Limited QNX≤ 1.0.2fstec_bduRU
blackberry qnx os for medical≤ 1.1.1nvdUScpe:2.3:o:blackberry:qnx_os_for_medical:*:*:*:*:*:*:*:*
blackberry qnx os for safety≤ 1.0.2nvdUScpe:2.3:o:blackberry:qnx_os_for_safety:*:*:*:*:*:*:*:*
blackberry qnx software development platform< 6.5.0nvdUScpe:2.3:a:blackberry:qnx_software_development_platform:*:*:*:*:*:*:*:*
blackberry qnx software development platform= 6.5.0nvdUScpe:2.3:a:blackberry:qnx_software_development_platform:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-qnx-TOxjVPdLBlackBerry QNX-2021-001 Vulnerability Affecting Cisco Products: August 20212021-08-18csaf · cisco_csafUS
On August 17, 2021, BlackBerry released a security advisory, QNX-2021-001 ["https://support.blackberry.com/kb/articleDetail?articleNumber=000082334"], that disclosed an integer overflow vulnerability in the following BlackBerry software releases: QNX Software Development Platform (SDP) – 6.5.0SP1 and earlier QNX OS for Medical – 1.1 and earlier QNX OS for Safety – 1.0.1 and earlier A successful exploit could allow an attacker to execute arbitrary code or cause a denial of service (DoS). For a description of this vulnerability, see QNX-2021-001 ["https://support.blackberry.com/kb/articleDetail?articleNumber=000082334"]. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-qnx-TOxjVPdL ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-qnx-TOxjVPdL"]

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd cisco_csaf NVD CVE.org MITRE

published 2021-08-17modified 2026-06-17

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references (11)

External citations — patches, advisories, analysis.

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