Cyber Resilience

CVE-2024-39921

Fujitsu Ipcom Ex2 In 3200 Firmware v01l02nf0001 – v01l06nf0401

Published
04 September 2024
Modified
13 March 2025
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS Score 0.0043 35th percentile
Risk Priority 57 floored blend · peak EPSS

Summary

CVE-2024-39921 is a high-severity Observable Discrepancy (CWE-203) vulnerability in Fujitsu Ipcom Ex2 In 3200 Firmware. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Account Discovery (T1087); ranked at the 35th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to IA-6 (Authentication Feedback) and SI-11 (Error Handling) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Observable timing discrepancy issue exists in IPCOM EX2 Series V01L02NF0001 to V01L06NF0401, V01L20NF0001 to V01L20NF0401, V02L20NF0001 to V02L21NF0301, and IPCOM VE2 Series V01L04NF0001 to V01L06NF0112. If this vulnerability is exploited, some of the encrypted communication may be decrypted by an…

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attacker who can obtain the contents of the communication.

CWE(s)
CWE-203

Related Threats

MITRE ATT&CK Enterprise Techniques

T1087 Account Discovery Discovery
Adversaries may attempt to get a listing of valid accounts, usernames, or email addresses on a system or within a compromised environment.
attack.mitre.org →
T1110 Brute Force Credential Access
Adversaries may use brute force techniques to gain access to accounts when passwords are unknown or when password hashes are obtained.
attack.mitre.org →
T1595 Active Scanning Reconnaissance
Adversaries may execute active reconnaissance scans to gather information that can be used during targeting.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-4095Same vendor: Fujitsu
CVE-2024-45089Shared CWE-203
CVE-2024-0564Shared CWE-203
CVE-2025-27667Shared CWE-203
CVE-2025-21510Shared CWE-203
CVE-2023-3462Shared CWE-203
CVE-2024-47154Shared CWE-203
CVE-2023-24598Shared CWE-203
CVE-2023-25741Shared CWE-203
CVE-2026-3579Shared CWE-203

Affected Assets

fujitsu
ipcom ve2 ls 100 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 ls 200 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 ls 220 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 ls plus 100 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 ls plus 200 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 ls plus 220 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 ls plus2 200 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 ls plus2 220 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 sc plus 100 firmware
v01l04nf0001 — v01l06nf0112
fujitsu
ipcom ve2 sc plus 200 firmware
v01l04nf0001 — v01l06nf0112
+9 more product configuration(s) — see NVD for full list

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 1 hardening rule · 1 OS baseline
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

IA-6 Authentication Feedback good match

Obscures authentication feedback so that success/failure differences are not observable to attackers.

SI-11 Error Handling good match

Requires error messages to avoid revealing exploitable details, directly stopping observable response discrepancies.

Mitigating Controls (NIST CSF 2.0) AI

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

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent observable response discrepancies via consistent error handling and timing.

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.

A.8.17 Clock synchronization none match
none

Accurate, synchronized timestamps reduce observable timing discrepancies that an attacker could exploit to infer sensitive information or distinguish between success and failure paths.

References