CVE-2021-39943 Vulnerability Analysis & Exploit Details

CVE-2021-39943
Vulnerability Scoring

4.3
/10
Medium Risk

The vulnerability CVE-2021-39943 could compromise system integrity but typically requires user interaction to be exploited.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2021-39943 Details

Status: Modified

Last updated: 🕕 21 Nov 2024, 06:20 UTC
Originally published on: 🕚 09 Feb 2022, 23:15 UTC

Time between publication and last update: 1015 days

CVSS Release: version 3

CVSS3 Source

cve@gitlab.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2021-39943 Vulnerability Summary

CVE-2021-39943: An authorization logic error in the External Status Check API in GitLab EE affecting all versions starting from 14.1 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2, allowed a user to update the status of the check via an API call

Assessing the Risk of CVE-2021-39943

Access Complexity Graph

The exploitability of CVE-2021-39943 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-2021-39943

CVE-2021-39943 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

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-2021-39943, 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-2021-39943, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2021-39943 has no significant impact on data confidentiality.
  • Integrity: Low
    Exploiting CVE-2021-39943 may cause minor changes to data without severely impacting its accuracy.
  • Availability: None
    CVE-2021-39943 does not impact system availability.

Exploit Prediction Scoring System (EPSS)

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

EPSS Score: 0.06% (probability of exploit)

EPSS Percentile: 27.96% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 72.03999999999999% of others.

CVE-2021-39943 References

External References

CWE Common Weakness Enumeration

CWE-863

Vulnerable Configurations

  • cpe:2.3:a:gitlab:gitlab:14.1.0:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.0:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.1:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.1:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.1:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.2:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.2:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.3:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.3:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.3:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.3:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.4:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.4:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.4:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.4:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.5:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.5:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.5:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.5:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.6:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.6:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.6:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.6:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.7:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.7:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.7:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.7:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.8:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.8:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.1.8:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.1.8:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.0:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.0:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.1:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.1:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.1:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.2:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.2:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.3:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.3:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.3:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.3:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.4:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.4:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.4:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.4:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.5:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.5:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.5:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.5:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.6:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.6:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.6:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.6:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.7:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.7:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.2.7:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.2.7:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3:*:*:*:*:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3:*:*:*:*:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.0:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.0:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.1:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.1:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.1:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.2:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.2:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.3:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.3:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.3:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.3:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.4:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.4:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.4:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.4:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.5:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.5:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.3.5:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.3.5:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:-:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:-:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:*:community:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:*:community:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:*:enterprise:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.0:*:*:*:*:enterprise:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.1:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.1:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.1:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.2:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.2:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.3:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.3:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.4.3:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.4.3:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.5.0:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.5.0:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.5.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.5.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.5.1:*:*:*:community:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.5.1:*:*:*:community:*:*:*
  • cpe:2.3:a:gitlab:gitlab:14.5.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:gitlab:gitlab:14.5.1:*:*:*:enterprise:*:*:*

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