CVE-2021-3843 Vulnerability Analysis & Exploit Details

CVE-2021-3843
Vulnerability Scoring

6.7
/10
High Risk

If left unpatched, CVE-2021-3843 could lead to major system disruptions or data loss.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: High
    High-level privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2021-3843 Details

Status: Modified

Last updated: 🕕 21 Nov 2024, 06:22 UTC
Originally published on: 🕙 12 Nov 2021, 22:15 UTC

Time between publication and last update: 1104 days

CVSS Release: version 3

CVSS3 Source

psirt@lenovo.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVE-2021-3843 Vulnerability Summary

CVE-2021-3843: A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.

Assessing the Risk of CVE-2021-3843

Access Complexity Graph

The exploitability of CVE-2021-3843 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-3843

The exploitability of CVE-2021-3843 is influenced by multiple factors. Security teams should analyze system configurations and apply appropriate countermeasures to mitigate threats.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-3843, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-3843, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2021-3843 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2021-3843 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2021-3843 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.042% (probability of exploit)

EPSS Percentile: 5.02% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 94.98% of others.

CVE-2021-3843 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:o:lenovo:thinkpad_11e_3rd_gen_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_11e_3rd_gen_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_11e_3rd_gen:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_11e_3rd_gen:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_11e_4th_gen_i3:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_11e_4th_gen_i3:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_11e_4th_gen_i7:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_11e_4th_gen_i7:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_11e_4th_gen_i5:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_11e_4th_gen_i5:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_11e_4th_gen_celeron:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_11e_4th_gen_celeron:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_11e_yoga_gen_6_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_11e_yoga_gen_6_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_11e_yoga_gen_6:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_11e_yoga_gen_6:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_13_gen_2_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_13_gen_2_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_13_gen_2:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_13_gen_2:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l13_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l13_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l13:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l13:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l13_gen_2_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l13_gen_2_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l13_gen_2:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l13_gen_2:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l13_yoga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l13_yoga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l13_yoga:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l13_yoga:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l13_yoga_gen_2_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l13_yoga_gen_2_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l13_yoga_gen_2:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l13_yoga_gen_2:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l14_gen_1:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l14_gen_1:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l14_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l14_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l14_firmware:1.2:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l14_firmware:1.2:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l14_firmware:1.3:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l14_firmware:1.3:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l14:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l14:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l15_gen_1:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l15_gen_1:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l15_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l15_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l15_firmware:1.2:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l15_firmware:1.2:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l15_firmware:1.3:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l15_firmware:1.3:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l15:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l15:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l380_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l380_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l380:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l380:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l380_yoga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l380_yoga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l380_yoga:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l380_yoga:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l390_yoga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l390_yoga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l390_yoga:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l390_yoga:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l390_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l390_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l390:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l390:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_s5_2nd_gen_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_s5_2nd_gen_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_s5_2nd_gen:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_s5_2nd_gen:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_t460_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_t460_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_t460:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_t460:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_s2_gen_6_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_s2_gen_6_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_s2_gen_6:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_s2_gen_6:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_s2_yoga_gen_6_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_s2_yoga_gen_6_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_s2_yoga_gen_6:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_s2_yoga_gen_6:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x12_detachable_gen_1_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x12_detachable_gen_1_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x12_detachable_gen_1:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x12_detachable_gen_1:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x260_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x260_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x260:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x260:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x380_yoga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x380_yoga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x380_yoga:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x380_yoga:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:1.95:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:1.95:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:6.0.36.1105:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:6.0.36.1105:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:2020-06-24:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:2020-06-24:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:n2let74w:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:n2let74w:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x390_yoga:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x390_yoga:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_11e_5th_gen:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_11e_5th_gen:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_yoga_370:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_yoga_370:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x1_fold_gen_1_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x1_fold_gen_1_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x1_fold_gen_1:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x1_fold_gen_1:-:*:*:*:*:*:*:*

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