CVE-2014-6271VulnerabilityPublished 01/28/2022Updated 10/24/2026

CVE-2014-6271: GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability

Affects GNU Bourne-Again Shell (Bash)Source CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 01/28/2022
KEV deadline: 07/28/2022
EPSS: 100.0% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2014-6271 (opens in a new tab)

Description

CVE-2014-6271 is a high-severity vulnerability in GNU Bash up to version 4.3 that allows remote attackers to execute arbitrary code. This occurs because Bash improperly processes trailing strings after function definitions in environment variable values. The vulnerability has been exploited in the wild.

Summary

GNU Bash versions through 4.3 contain a vulnerability where trailing strings after function definitions in environment variable values are processed, enabling remote code execution. This flaw allows attackers to inject and execute arbitrary commands by crafting environment variables that Bash evaluates incorrectly.

Impact

Successful exploitation allows remote attackers to execute arbitrary code on affected systems, potentially leading to full system compromise. The vulnerability has been observed in active exploitation scenarios.

Mitigation

Patch status is not explicitly provided in the input data. Users should consult the official GNU Bash vendor advisory for current patch and remediation guidance. Until patched, mitigations may include disabling or restricting Bash usage in exposed environments.

Weaknesses

CWE-78OS Command Injection (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 10:10:33 UTC

Weaknesses

References

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