CVE-2021-33790 Vulnerability Analysis & Exploit Details

CVE-2021-33790
Vulnerability Scoring

9.8
/10
Critical Risk

As a catastrophic security flaw, CVE-2021-33790 has severe implications, demanding immediate intervention.

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: None
    No 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-2021-33790 Details

Status: Modified

Last updated: 🕕 21 Nov 2024, 06:09 UTC
Originally published on: 🕓 31 May 2021, 04:15 UTC

Time between publication and last update: 1270 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

CVE-2021-33790 Vulnerability Summary

CVE-2021-33790: The RebornCore library before 4.7.3 allows remote code execution because it deserializes untrusted data in ObjectInputStream.readObject as part of reborncore.common.network.ExtendedPacketBuffer. An attacker can instantiate any class on the classpath with any data. A class usable for exploitation might or might not be present, depending on what Minecraft modifications are installed.

Assessing the Risk of CVE-2021-33790

Access Complexity Graph

The exploitability of CVE-2021-33790 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-2021-33790

With low attack complexity and no required privileges, CVE-2021-33790 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

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-2021-33790, 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-2021-33790, 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-2021-33790 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2021-33790 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2021-33790 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: 12.552% (probability of exploit)

EPSS Percentile: 95.56% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 4.439999999999998% of others.

CVE-2021-33790 References

External References

CWE Common Weakness Enumeration

CWE-502

CAPEC Common Attack Pattern Enumeration and Classification

  • Object Injection CAPEC-586 An adversary attempts to exploit an application by injecting additional, malicious content during its processing of serialized objects. Developers leverage serialization in order to convert data or state into a static, binary format for saving to disk or transferring over a network. These objects are then deserialized when needed to recover the data/state. By injecting a malformed object into a vulnerable application, an adversary can potentially compromise the application by manipulating the deserialization process. This can result in a number of unwanted outcomes, including remote code execution.

Vulnerable Configurations

  • cpe:2.3:a:techreborn:reborncore:3.4.10:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.4.10:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.4.11:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.4.11:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.4.12:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.4.12:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.5.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.5.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.5.4:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.5.4:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.4:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.4:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.5:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.5:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.6:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.6:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.7:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.7:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.8:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.8:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.9:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.9:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.10:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.10:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.11:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.11:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.12:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.12:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.13:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.13:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.6.14:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.6.14:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.7.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.7.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.7.4:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.7.4:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.7.5:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.7.5:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.4:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.4:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.5:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.5:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.6:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.6:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.7:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.7:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.8:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.8:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.8.9:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.8.9:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.9.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.9.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.9.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.9.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.9.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.9.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.10.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.10.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.10.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.10.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.10.4:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.10.4:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.10.5:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.10.5:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.10.6:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.10.6:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.12.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.12.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.4:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.4:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.5:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.5:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.6:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.6:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.7:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.7:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.13.8:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.13.8:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.19.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.19.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.19.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.19.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.19.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.19.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:3.19.4:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:3.19.4:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.4:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.4:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.5:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.5:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.6:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.6:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.7:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.7:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.8:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.8:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.2.9:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.2.9:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:techreborn:reborncore:4.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:techreborn:reborncore:4.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:minecraft:minecraft:-:*:*:*:*:*:*:*
    cpe:2.3:a:minecraft:minecraft:-:*:*:*:*:*:*:*

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