CVE-2024-39921 — Observable timing discrepancy issue exists in IPCOM EX2 Series V01L02NF0001 to V

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

01What is this vulnerability?

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 attacker who can obtain the contents of the communication.

02Affected products

Vendor	Product	Versions
Fsas Technologies Inc.	IPCOM EX2 Series	V01L02NF0001 to V01L06NF0401
Fsas Technologies Inc.	IPCOM EX2 Series	V01L20NF0001 to V01L20NF0401
Fsas Technologies Inc.	IPCOM EX2 Series	V02L20NF0001 to V02L21NF0301
Fsas Technologies Inc.	IPCOM VE2 Series	V01L04NF0001 to V01L06NF0112

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2024-09-04T01:51:14.241Z
• Last modified: 2025-03-13T13:26:40.037Z

09References

• www.fujitsu.com — https://www.fujitsu.com/jp/products/network/support/2024/ipcom-04/
• jvn.jp — https://jvn.jp/en/jp/JVN29238389/