CVE-2021-3493 Vulnerability Analysis & Exploit Details

CVE-2021-3493
Vulnerability Scoring

8.8
/10
Severe Risk

Cybersecurity professionals consider CVE-2021-3493 an immediate threat requiring urgent mitigation.

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: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Changed
    Successful exploitation can impact components beyond the vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2021-3493 Details

Status: Analyzed

Last updated: 🕢 19 Feb 2025, 19:47 UTC
Originally published on: 🕔 17 Apr 2021, 05:15 UTC

Time between publication and last update: 1404 days

CVSS Release: version 3

CVSS3 Source

security@ubuntu.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2021-3493 Vulnerability Summary

CVE-2021-3493: The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.

Assessing the Risk of CVE-2021-3493

Access Complexity Graph

The exploitability of CVE-2021-3493 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-2021-3493

CVE-2021-3493 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-2021-3493, 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-2021-3493, 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-2021-3493 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2021-3493 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2021-3493 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: 1.177% (probability of exploit)

EPSS Percentile: 85.21% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 14.790000000000006% of others.

CVE-2021-3493 References

External References

CWE Common Weakness Enumeration

CWE-863

Vulnerable Configurations

  • cpe:2.3:o:canonical:ubuntu_linux:-:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:-:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:4.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:4.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:5.04:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:5.04:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:5.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:5.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:6.06:-:lts:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:6.06:-:lts:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:6.06.1:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:6.06.1:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:6.06.1:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:6.06.1:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:6.06.2:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:6.06.2:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:6.06.2:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:6.06.2:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:6.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:6.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:7.04:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:7.04:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:7.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:7.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.04:-:lts:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.04:-:lts:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:-:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:-:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.04.1:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.04.1:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.04.2:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.04.2:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.04.3:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.04.3:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.04.4:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.04.4:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:9.04:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:9.04:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:9.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:9.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04:-:lts:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04:-:lts:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:-:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:-:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04.1:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04.1:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04.1:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04.1:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04.2:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04.2:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04.2:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04.2:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04.3:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04.3:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04.3:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04.3:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04.4:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04.4:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.04.4:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.04.4:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:10.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:10.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:11.04:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:11.04:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:-:lts:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04:-:lts:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.1:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.1:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.1:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.1:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.2:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.2:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.2:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.2:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.3:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.3:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.3:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.3:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.4:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.4:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.4:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.4:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.5:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.5:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.04.5:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.04.5:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:13.04:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:13.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.1:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.1:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.1:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.1:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.2:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.2:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.2:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.2:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.3:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.3:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.3:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.3:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.4:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.4:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.4:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.4:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.5:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.5:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.5:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.5:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.04.6:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.04.6:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:x64:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:x64:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:-:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:-:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:16.04.1:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:16.04.1:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04.1:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04.2:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:16.04.2:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:16.04.3:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04.3:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04.3:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04.3:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04.4:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04.4:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04.4:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04.4:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04.4:*:*:*:lts:*:x64:*
    cpe:2.3:o:canonical:ubuntu_linux:16.04.4:*:*:*:lts:*:x64:*
  • cpe:2.3:o:canonical:ubuntu_linux:16.04.5:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:16.04.6:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:16.10:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:17.04:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:18.04.1:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:18.04.2:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:18.04.3:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:18.04.4:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:18.04.5:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:18.04.6:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:-:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:*:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:*:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
    cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
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  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:-:*:*:*
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    cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:*:*:*:*

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