How severe is CVE-2021-3849?

CVE-2021-3849 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3849 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3849?

CVE-2021-3849 primarily affects Lenovo Nextscale N1200 Enclosure Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3849?

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

When was CVE-2021-3849 published?

CVE-2021-3849 was published on 2022-04-22 and last updated on 2026-06-17.

CVE-2021-3849

CVE-2021-3849 is a critical-severity vulnerability in Lenovo Nextscale N1200 Enclosure Firmware with a CVSS 3.x base score of 9.8. 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-288.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-288
Affected product: Lenovo Nextscale N1200 Enclosure Firmware
Published: 2022-04-22
Last modified: 2026-06-17

Description

An authentication bypass vulnerability was discovered in the web interface of the Lenovo Fan Power Controller2 (FPC2) and Lenovo System Management Module (SMM) firmware that could allow an unauthenticated attacker to execute commands on the SMM and FPC2. SMM2 is not affected.

Frequently asked questions

What is CVE-2021-3849?: An authentication bypass vulnerability was discovered in the web interface of the Lenovo Fan Power Controller2 (FPC2) and Lenovo System Management Module (SMM) firmware that could allow an unauthenticated attacker to execute commands on the SMM and FPC2. SMM2 is not affected.
How severe is CVE-2021-3849?: CVE-2021-3849 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3849 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3849?: CVE-2021-3849 primarily affects Lenovo Nextscale N1200 Enclosure Firmware. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3849?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-3849 published?: CVE-2021-3849 was published on 2022-04-22 and last updated on 2026-06-17.

References

https://support.lenovo.com/us/en/product_security/LEN-72615

Affected products (5)

cpe:2.3:o:lenovo:nextscale_n1200_enclosure_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkagile_hx_enclosure_certified_node_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkagile_vx_enclosure_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinksystem_d2_enclosure_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ibm:nextscale_fan_power_controller_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Lenovo Nextscale N1200 Enclosure Firmware

CVE-2021-3897 — Critical (CVSS 9.8): An authentication bypass vulnerability was discovered in an internal service of the Lenovo Fan Power Controller2 (FPC2)…
CVE-2023-2992 — High (CVSS 7.5): An unauthenticated denial of service vulnerability exists in the SMM v1, SMM v2, and FPC management web server which…
CVE-2024-2659 — High (CVSS 7.2): A command injection vulnerability was identified in SMM/SMM2 and FPC that could allow an authenticated user with…
CVE-2023-2993 — Medium (CVSS 5.4): A valid, authenticated user with limited privileges may be able to use specifically crafted web management server API…

All CVEs affecting Lenovo Nextscale N1200 Enclosure Firmware →

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