Authentication bypass in Lenovo Fan Power Controller2
Priority MEDIUM 45CWE-288Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-288.
Summary
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.
Why it matters now
EPSS 0.01303 70th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Lenovo | Fan Power Controller2 (FPC2) | various | — | No fix listed | CNA |
| Lenovo | Lenovo System Management Module (SMM) | various | — | No fix listed | CNA |
- Fan Power Controller2 (FPC2) VendorLenovo Affected various Fixed in — No fix listed CNA
- Lenovo System Management Module (SMM) VendorLenovo Affected various Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:lenovo:nextscale_n1200_enclosure_firmware:*:*:*:*:*:*:*:* | before fhet50b-2.90 | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:nextscale_n1200_enclosure:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
| cpe:2.3:o:lenovo:thinkagile_hx_enclosure_certified_node_firmware:*:*:*:*:*:*:*:* | before tesm28b-1.21 | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:thinkagile_hx_enclosure_certified_node:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
| cpe:2.3:o:lenovo:thinkagile_vx_enclosure_firmware:*:*:*:*:*:*:*:* | before tesm28b-1.21 | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:thinkagile_vx_enclosure:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
| cpe:2.3:o:lenovo:thinksystem_d2_enclosure_firmware:*:*:*:*:*:*:*:* | before tesm28b-1.21 | Vulnerable | Lenovo |
| cpe:2.3:h:lenovo:thinksystem_d2_enclosure:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Lenovo |
| cpe:2.3:o:ibm:nextscale_fan_power_controller_firmware:*:*:*:*:*:*:*:* | before 44a-3.70 | Vulnerable | IBM |
| cpe:2.3:h:ibm:nextscale_fan_power_controller:-:*:*:*:*:*:*:* | not specified by NVD | Running on | IBM |
- cpe:2.3:o:lenovo:nextscale_n1200_enclosure_firmware:*:*:*:*:*:*:*:* Versions before fhet50b-2.90 Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:nextscale_n1200_enclosure:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
- cpe:2.3:o:lenovo:thinkagile_hx_enclosure_certified_node_firmware:*:*:*:*:*:*:*:* Versions before tesm28b-1.21 Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:thinkagile_hx_enclosure_certified_node:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
- cpe:2.3:o:lenovo:thinkagile_vx_enclosure_firmware:*:*:*:*:*:*:*:* Versions before tesm28b-1.21 Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:thinkagile_vx_enclosure:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
- cpe:2.3:o:lenovo:thinksystem_d2_enclosure_firmware:*:*:*:*:*:*:*:* Versions before tesm28b-1.21 Vulnerable ·Lenovo
- cpe:2.3:h:lenovo:thinksystem_d2_enclosure:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Lenovo
- cpe:2.3:o:ibm:nextscale_fan_power_controller_firmware:*:*:*:*:*:*:*:* Versions before 44a-3.70 Vulnerable ·IBM
- cpe:2.3:h:ibm:nextscale_fan_power_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·IBM
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3849
- 2026-10-03 Alias added: GHSA-vxqg-r9mf-h85v
References
More Lenovo Nextscale N1200 Enclosure Firmware vulnerabilities
- TI-2021-02807 Authentication bypass in Lenovo Fan Power Controller2 CVSS 3.1CRITICAL 9.8
- TI-2023-02803 An unauthenticated denial of service vulnerability exists in the SMM v1, SMM v2, and FPC… CVSS 3.1HIGH 7.5
- TI-2024-02474 OS command injection in Lenovo SMM, SMM2, FPC CVSS 3.1HIGH 7.2
- TI-2023-02804 A valid, authenticated user with limited privileges may be able to use specifically… CVSS 3.1MEDIUM 6.3
Sources
- CVE-2021-3849 · CVE Program
- CVE-2021-3849 · NVD
- FIRST EPSS
- GHSA-vxqg-r9mf-h85v · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences