How severe is CVE-2021-3723?

CVE-2021-3723 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3723 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3723?

CVE-2021-3723 primarily affects Ibm System X3550 M3 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3723?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3723 published?

CVE-2021-3723 was published on 2021-11-12 and last updated on 2026-06-17.

CVE-2021-3723

CVE-2021-3723 is a high-severity vulnerability in Ibm System X3550 M3 Firmware with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 9.0
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Ibm System X3550 M3 Firmware
Published: 2021-11-12
Last modified: 2026-06-17

Description

A command injection vulnerability was reported in the Integrated Management Module (IMM) of legacy IBM System x 3550 M3 and IBM System x 3650 M3 servers that could allow the execution of operating system commands over an authenticated SSH or Telnet session.

Frequently asked questions

What is CVE-2021-3723?: A command injection vulnerability was reported in the Integrated Management Module (IMM) of legacy IBM System x 3550 M3 and IBM System x 3650 M3 servers that could allow the execution of operating system commands over an authenticated SSH or Telnet session.
How severe is CVE-2021-3723?: CVE-2021-3723 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3723 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3723?: CVE-2021-3723 primarily affects Ibm System X3550 M3 Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3723?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3723 published?: CVE-2021-3723 was published on 2021-11-12 and last updated on 2026-06-17.

References

https://support.lenovo.com/us/en/product_security/LEN-66347

Affected products (2)

cpe:2.3:o:ibm:system_x3550_m3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ibm:system_x3650_m3_firmware:*:*:*:*:*:*:*:*

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