CVE-2021-22863 Vulnerability Analysis & Exploit Details

CVE-2021-22863
Vulnerability Scoring

8.1
/10
Severe Risk

Cybersecurity professionals consider CVE-2021-22863 an immediate threat requiring urgent mitigation.

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-2021-22863 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:50 UTC
Originally published on: 🕓 03 Mar 2021, 04:15 UTC

Time between publication and last update: 1359 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2021-22863 Vulnerability Summary

CVE-2021-22863: An improper access control vulnerability was identified in the GitHub Enterprise Server GraphQL API that allowed authenticated users of the instance to modify the maintainer collaboration permission of a pull request without proper authorization. By exploiting this vulnerability, an attacker would be able to gain access to head branches of pull requests opened on repositories of which they are a maintainer. Forking is disabled by default for organization owned private repositories and would prevent this vulnerability. Additionally, branch protections such as required pull request reviews or status checks would prevent unauthorized commits from being merged without further review or validation. This vulnerability affected all versions of GitHub Enterprise Server since 2.12.22 and was fixed in versions 2.20.24, 2.21.15, 2.22.7 and 3.0.1. This vulnerability was reported via the GitHub Bug Bounty program.

Assessing the Risk of CVE-2021-22863

Access Complexity Graph

The exploitability of CVE-2021-22863 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-2021-22863

CVE-2021-22863 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-2021-22863, 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-2021-22863, 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-2021-22863 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2021-22863 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: None
    CVE-2021-22863 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: 0.17% (probability of exploit)

EPSS Percentile: 55.17% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 44.83% of others.

CVE-2021-22863 References

External References

CWE Common Weakness Enumeration

NVD-CWE-Other

Vulnerable Configurations

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  • cpe:2.3:a:github:github:2.18.16:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.18.16:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.18.17:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.18.17:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.18.19:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.18.19:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.18.20:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.18.20:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.1:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.3:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.3:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.4:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.4:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.5:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.5:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.6:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.6:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.7:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.7:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.8:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.8:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.9:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.9:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.10:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.10:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.11:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.11:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.12:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.12:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.13:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.13:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.14:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.14:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.15:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.15:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.19.21:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.19.21:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.1:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.3:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.3:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.4:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.4:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.5:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.5:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.6:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.6:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.7:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.7:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.8:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.8:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.9:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.9:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.10:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.10:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.11:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.11:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.12:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.12:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.13:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.13:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.14:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.14:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.15:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.15:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.16:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.16:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.17:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.17:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.18:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.18:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.19:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.19:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.20:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.20:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.21:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.21:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.22:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.22:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.20.23:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.20.23:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.1:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.3:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.3:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.4:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.4:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.5:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.5:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.6:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.6:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.7:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.7:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.8:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.8:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.9:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.9:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.10:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.10:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.11:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.11:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.12:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.12:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.13:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.13:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.21.14:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.21.14:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.22.0:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.22.0:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.22.1:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.22.1:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.22.2:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.22.2:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.22.3:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.22.3:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.22.4:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.22.4:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.22.5:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.22.5:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:2.22.6:*:*:*:enterprise:*:*:*
    cpe:2.3:a:github:github:2.22.6:*:*:*:enterprise:*:*:*
  • cpe:2.3:a:github:github:3.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:github:github:3.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:github:github:3.0.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:github:github:3.0.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:github:github:3.0.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:github:github:3.0.0:rc2:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-22863: Combat Critical CVE Threats

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