9.8
CRITICAL
CVE-2021-3849
Lenovo Fan Power Controller2 & System Management Module Authentication Bypass Vulnerability
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.

INFO

Published Date :

April 22, 2022, 9:15 p.m.

Last Modified :

Oct. 27, 2022, 11:55 a.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-3849 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Lenovo nextscale_n1200_enclosure_firmware
2 Lenovo thinkagile_hx_enclosure_certified_node_firmware
3 Lenovo thinkagile_vx_enclosure_firmware
4 Lenovo thinksystem_d2_enclosure_firmware
1 Ibm nextscale_fan_power_controller_firmware
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-3849.

URL Resource
https://support.lenovo.com/us/en/product_security/LEN-72615 Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-3849 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-3849 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Oct. 27, 2022

    Action Type Old Value New Value
    Removed CWE NIST CWE-287
    Added CWE NIST NVD-CWE-noinfo
  • Initial Analysis by [email protected]

    May. 09, 2022

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://support.lenovo.com/us/en/product_security/LEN-72615 No Types Assigned https://support.lenovo.com/us/en/product_security/LEN-72615 Vendor Advisory
    Added CWE NIST CWE-287
    Added CPE Configuration AND OR *cpe:2.3:o:lenovo:nextscale_n1200_enclosure_firmware:*:*:*:*:*:*:*:* versions up to (excluding) fhet50b-2.90 OR cpe:2.3:h:lenovo:nextscale_n1200_enclosure:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:lenovo:thinkagile_hx_enclosure_certified_node_firmware:*:*:*:*:*:*:*:* versions up to (excluding) tesm28b-1.21 OR cpe:2.3:h:lenovo:thinkagile_hx_enclosure_certified_node:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:lenovo:thinkagile_vx_enclosure_firmware:*:*:*:*:*:*:*:* versions up to (excluding) tesm28b-1.21 OR cpe:2.3:h:lenovo:thinkagile_vx_enclosure:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:lenovo:thinksystem_d2_enclosure_firmware:*:*:*:*:*:*:*:* versions up to (excluding) tesm28b-1.21 OR cpe:2.3:h:lenovo:thinksystem_d2_enclosure:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:ibm:nextscale_fan_power_controller_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 44a-3.70 OR cpe:2.3:h:ibm:nextscale_fan_power_controller:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Apr. 22, 2022

    Action Type Old Value New Value
    Changed 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. 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.
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-3849 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-3849 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.17 }} -0.00%

score

0.54253

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability