Security readout for executives and security teams
Plain-English summary
This flaw affects older BlackBerry QNX runtime libraries used in some embedded, medical, and safety-oriented systems. A remote, unauthenticated attacker could potentially crash affected software or run code, but the CVSS vector marks attack complexity as high. Business urgency depends on whether affected QNX versions are present in deployed products or operational technology.
Executive priority
Treat as high-priority exposure discovery and vendor coordination. Do not assume all QNX-based assets are affected, but prioritize medical, safety, operational, or internet-reachable systems running the listed older versions.
Technical view
CVE-2021-22156 is a CWE-190 integer overflow in calloc() in the C runtime library for affected QNX SDP, QNX OS for Medical, and QNX OS for Safety versions. The stated impact is denial of service or arbitrary code execution, with CVSS 3.1 score 9.0 and network attack vector.
Likely exposure
Exposure is most likely where legacy QNX SDP 6.5.0 SP1 or earlier, QNX OS for Medical 1.1 or earlier, or QNX OS for Safety 1.0.1 or earlier is embedded in products. Confirm through SBOMs, vendor attestations, build records, and OEM advisories.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is serious because affected runtime code may sit inside long-lived embedded systems, but the provided CVSS vector indicates high attack complexity.
Researcher notes
The supplied evidence identifies affected operating system families and versions, impact, CVSS, and references, but not specific fixed versions or exploit observations. Avoid product-level conclusions unless confirmed by BlackBerry, Cisco, an OEM, SBOM, or local build evidence.
Mitigation direction
- Identify products and firmware built with affected QNX versions.
- Review BlackBerry advisory 000082334 for official fixes or mitigations.
- Review Cisco advisory where Cisco-managed products may be involved.
- Apply vendor-provided updates or mitigations after confirming applicability.
- Restrict network exposure to affected devices pending remediation.
Validation and detection
- Check SBOMs and vendor attestations for affected QNX versions.
- Ask OEMs whether their shipped firmware includes vulnerable calloc().
- Map network-reachable services on confirmed affected systems.
- Verify remediation status against BlackBerry and product-vendor advisories.
- Document systems where vendor guidance is unavailable or pending.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-190: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-22156 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H2.26Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://support.blackberry.com/kb/articleDetail?articleNumber=000082334CVE reference · x_refsource_MISC
- 20210818 BlackBerry QNX-2021-001 Vulnerability Affecting Cisco Products: August 2021CVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.