CVE-2021-20046 Security Vulnerability & Exploit Details

CVE-2021-20046
Vulnerability Scoring

8.8

/10

Severe Risk

Cybersecurity professionals consider CVE-2021-20046 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-2021-20046 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:45 UTC
Originally published on: 🕑 10 Jan 2022, 14:10 UTC

Time between publication and last update: 1045 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:H

CVE-2021-20046 Vulnerability Summary

CVE-2021-20046: A Stack-based buffer overflow in the SonicOS HTTP Content-Length response header allows a remote authenticated attacker to cause Denial of Service (DoS) and potentially results in code execution in the firewall. This vulnerability affected SonicOS Gen 5, Gen 6 and Gen 7 firmware versions.

Assessing the Risk of CVE-2021-20046

Access Complexity Graph

The exploitability of CVE-2021-20046 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-2021-20046

CVE-2021-20046 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-2021-20046, 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-2021-20046, 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-2021-20046 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2021-20046 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: High
CVE-2021-20046 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: 0.316% (probability of exploit)

EPSS Percentile: 70.5% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 29.5% of others.

CVE-2021-20046 References

External References

CWE Common Weakness Enumeration

CWE-787

Vulnerable Configurations

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cpe:2.3:h:sonicwall:soho_250:-:*:*:*:*:*:*:*
cpe:2.3:h:sonicwall:soho_250:-:*:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2021-20046: Combat Critical CVE Threats

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