Security Resilience

CVE-2023-30024

Access Control in Magicjack A921 Firmware 1.4

Public PoCAccess Control
Published
28 April 2023
Modified
31 January 2025
Patch / advisory
CVSS Score v3.1 6.6
Click a component to see what it means
Raw vectorCVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0047 39th percentile
Risk Priority 49 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-30024 is a medium-severity Improper Privilege Management (CWE-269) vulnerability in Magicjack A921 Firmware. Its CVSS base score is 6.6 (Medium).

Operationally, ranked at the 39th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

EU & UK References

Vulnerability Data

The MagicJack device, a VoIP solution for internet phone calls, contains a hidden NAND flash memory partition allowing unauthorized read/write access. Attackers can exploit this by replacing the original software with a malicious version, leading to ransomware deployment on the…

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host computer. Affected devices have firmware versions prior to magicJack A921 USB Phone Jack Rev 3.0 V1.4.

CWE(s)

Related Threats

CVEs Like This One

CVE-2026-68561Shared CWE-269, CWE-863
CVE-2026-72886Shared CWE-269, CWE-863
CVE-2023-50726Shared CWE-269, CWE-863
CVE-2026-40291Shared CWE-269, CWE-863
CVE-2026-94609Shared CWE-269, CWE-863
CVE-2026-29127Shared CWE-269, CWE-863
CVE-2023-34146Shared CWE-269, CWE-863
CVE-2026-27899Shared CWE-269, CWE-863
CVE-2023-38058Shared CWE-269, CWE-863
CVE-2023-34147Shared CWE-269, CWE-863

Affected Assets

magicjack
a921 firmware
1.4

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-269 CWE-863

Policy addresses roles, responsibilities, and privilege management to prevent improper privilege assignments.

addresses: CWE-269 CWE-863

Access supervision ensures privileges are assigned and managed without improper escalation or retention.

addresses: CWE-269 CWE-863

Assigning group/role memberships and access authorizations (privileges) while reviewing accounts addresses improper privilege management.

addresses: CWE-863 CWE-269

The small, testable reference monitor reduces the likelihood of incorrect authorization implementations.

addresses: CWE-863 CWE-269

Certification evaluates whether authorization decisions are correctly implemented and enforced.

addresses: CWE-863 CWE-269

Periodic review and documentation of connection needs reduces incorrect authorization.

addresses: CWE-269 CWE-863

Restricting who can perform changes helps ensure privileges are managed properly rather than assigned broadly.

addresses: CWE-269 CWE-863

Manages privileges by authorizing only approved personnel and supervising those lacking required authorizations for maintenance.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

blocks

A.5.15 directly mandates determining access requirements, defining/enforcing topic-specific access control policy, assigning rights/restrictions by entity/role, consistency with classification, need-to-know, privileged access restrictions, segregation, formal authorization, and dynamic rules — which stops most improper privilege management from being exploitable; bounded remainder is flawed implementation of those rules (e.g. incorrect mapping or enforcement bugs).

blocks

A.5.18 directly governs the provisioning, review, modification and timely revocation of access rights (including for role changes, termination and privilege levels), which stops most improper privilege spheres from being exploitable even if the assignment flaw exists; the bounded remainder is flaws in the underlying enforcement mechanism itself (e.g. AC-3/A.8.3)

blocks

Defining and communicating authorization levels for each role limits the assignment of excessive or unnecessary privileges.

A.8.15 Logging partial match
finds

Logging every use of privileges and protecting those records makes it harder for an attacker who has obtained elevated rights to operate without leaving evidence.

blocks

A.8.2 directly controls the identification, allocation, review, expiry, temporary use, and separation of privileged rights per policy, which prevents most improper privilege management (CWE-269) by design; the bounded remainder is flawed tracking/checking logic inside the product's own enforcement code (the AC-3 slice of 269).

blocks

A.8.27 mandates security-by-design principles including least privilege, default deny, fail securely, defence in depth, security architecture integration, hardening, and zero-trust verification of every request; these directly stop most improper privilege spheres from being exploitable even if the assignment flaw remains, with a bounded remainder (e.g. certain legacy or safety-overridden controls).

Hardening callouts derived

DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.

  • No fine-grained STIG row for CWE-269, a class-level weakness. Rules are authored against its narrower children: CWE-250, CWE-266, CWE-267, CWE-268, CWE-270, CWE-274.
  • No fine-grained STIG row for CWE-863, a class-level weakness, and none of its children carries one either.

References