CVE-2017-3768: An unprivileged attacker with connectivity to the IMM2 could cause a denial of service attack on the IMM2 (Ver
48
This month
HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE
CVE-2017-3768 is a high-severity flaw (CVSS 7.5) affecting flex system x240 m5 firmware, flex system x280 x6 firmware, flex system x440 m4 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An unprivileged attacker with connectivity to the IMM2 could cause a denial of service attack on the IMM2 (Versions earlier than 4.4 for Lenovo System x and earlier than 6.4 for IBM System x). Flooding the IMM2 with a high volume of authentication failures via the Common Information Model (CIM) used by LXCA and OneCLI and other tools can exhaust available system memory which can cause the IMM2 to reboot itself until the requests cease.
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
lenova flex system x240 m5 firmware UPGRADE
Affected: < 4.4
Fixed in: 4.4
Safe to downgrade to: no unaffected older release
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.
lenova flex system x280 x6 firmware UPGRADE
Affected: < 4.4
Fixed in: 4.4
Safe to downgrade to: no unaffected older release
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.
lenova flex system x440 m4 firmware UPGRADE
Affected: < 4.4
Fixed in: 4.4
Safe to downgrade to: no unaffected older release
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.
lenova flex system x480 x6 firmware UPGRADE
Affected: < 4.4
Fixed in: 4.4
Safe to downgrade to: no unaffected older release
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.
lenova flex system x880 firmware UPGRADE
Affected: < 4.4
Fixed in: 4.4
Safe to downgrade to: no unaffected older release
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.
lenova nextscale nx360 m5 firmware UPGRADE
Affected: < 4.4
Fixed in: 4.4
Safe to downgrade to: no unaffected older release
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-2017-3768?
flex system x240 m5 firmware: upgrade to 4.4; flex system x280 x6 firmware: upgrade to 4.4; flex system x440 m4 firmware: upgrade to 4.4. Exact commands for each OS are on this page.
Is CVE-2017-3768 being exploited?
CVE-2017-3768 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-2017-3768 affect?
CVE-2017-3768 affects flex system x240 m5 firmware, flex system x280 x6 firmware, flex system x440 m4 firmware. Severity is high (CVSS 7.5). An unprivileged attacker with connectivity to the IMM2 could cause a denial of service attack on the IMM2 (Versions earlier than 4.4 for Lenovo System x and earlier than 6.4 for IBM System x). Flooding the IMM2 with a high volume of authent
How urgent is CVE-2017-3768?
Priority 48/100. High severity; Remotely exploitable, no login, no user action
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