CVE & CISA-KEV Catalog

CVE-2014-6271

CRITICALCISA KEVEPSS 100th pctl
9.8
CVSS v3
NVD

Description

GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution, aka "ShellShock." NOTE: the original fix for this issue was incorrect; CVE-2014-7169 has been assigned to cover the vulnerability that is still present after the incorrect fix.

CWE-78OS Command Injection

How to fix

Remediation Available
bashDebian
Fixed in:4.3-9.1CVE-2014-6271
Fixed in:4.3-9.1CVE-2014-6271
Fixed in:4.3-9.1CVE-2014-6271
Fixed in:4.3-9.1CVE-2014-6271
bashUbuntu
Fixed in:4.3-7ubuntu1.1USN-2362-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

100.00%probability of exploitation in 30 days
100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability

GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute code.

Apply updates per vendor instructions.

Remediation due: 2022-07-28

References

Vendor Advisory2

Related Vulnerabilities

Other CWE-78 (OS Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2021-1498Critical9.8100%KEVFix
CVE-2019-16920Critical9.8100%KEV-
CVE-2022-44877Critical9.8100%KEVFix
CVE-2020-8515Critical9.8100%KEV-
CVE-2024-4577Critical9.8100%KEV + RansomFix
CVE-2020-9054Critical9.8100%KEVFix

Common questions

How do I fix CVE-2014-6271?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2014-6271 being actively exploited?

Yes. CVE-2014-6271 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-07-28. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2014-6271?

CVE-2014-6271 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2014-6271 affect?

Published advisories record a fix for bash (Debian), bash (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2014-6271
CVE-2014-6271 severity badge

Markdown

[![CVE-2014-6271](https://tridentstack.com/cve/badge/CVE-2014-6271.svg)](https://tridentstack.com/cve/CVE-2014-6271)

HTML

<a href="https://tridentstack.com/cve/CVE-2014-6271"><img src="https://tridentstack.com/cve/badge/CVE-2014-6271.svg" alt="CVE-2014-6271"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it worksStart freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.