CVE-2024-39921: Observable timing discrepancy issue exists in IPCOM EX2 Series V01L02NF0001 to V01L06NF0401, V01L20NF0001 to V
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HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE
CVE-2024-39921 is a high-severity flaw (CVSS 7.5) affecting ipcom ve2 ls 100 firmware, ipcom ve2 ls 200 firmware, ipcom ve2 ls 220 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
fujitsu ipcom ve2 ls 100 firmware UPGRADE
Affected: >= v01l04nf0001 and <= v01l06nf0112
Fixed in: newer than v01l06nf0112
Safe to downgrade to: a release before v01l04nf0001
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fujitsu ipcom ve2 ls 200 firmware UPGRADE
Affected: >= v01l04nf0001 and <= v01l06nf0112
Fixed in: newer than v01l06nf0112
Safe to downgrade to: a release before v01l04nf0001
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fujitsu ipcom ve2 ls 220 firmware UPGRADE
Affected: >= v01l04nf0001 and <= v01l06nf0112
Fixed in: newer than v01l06nf0112
Safe to downgrade to: a release before v01l04nf0001
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fujitsu ipcom ve2 ls plus 100 firmware UPGRADE
Affected: >= v01l04nf0001 and <= v01l06nf0112
Fixed in: newer than v01l06nf0112
Safe to downgrade to: a release before v01l04nf0001
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fujitsu ipcom ve2 ls plus 200 firmware UPGRADE
Affected: >= v01l04nf0001 and <= v01l06nf0112
Fixed in: newer than v01l06nf0112
Safe to downgrade to: a release before v01l04nf0001
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fujitsu ipcom ve2 ls plus 220 firmware UPGRADE
Affected: >= v01l04nf0001 and <= v01l06nf0112
Fixed in: newer than v01l06nf0112
Safe to downgrade to: a release before v01l04nf0001
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official sourceNVD · CVE Program · Report a problem with this page Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2024-39921?
ipcom ve2 ls 100 firmware: upgrade to newer than v01l06nf0112; ipcom ve2 ls 200 firmware: upgrade to newer than v01l06nf0112; ipcom ve2 ls 220 firmware: upgrade to newer than v01l06nf0112. Exact commands for each OS are on this page.
Is CVE-2024-39921 being exploited?
CVE-2024-39921 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2024-39921 affect?
CVE-2024-39921 affects ipcom ve2 ls 100 firmware, ipcom ve2 ls 200 firmware, ipcom ve2 ls 220 firmware. Severity is high (CVSS 7.5). 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,
How urgent is CVE-2024-39921?
Priority 40/100. High severity; Remotely exploitable, no login, no user action
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