Is CVE-2014-6271 in the CISA KEV catalog?

Yes. CVE-2014-6271 is on the CISA Known Exploited Vulnerabilities list, added 2022-01-28.

What is the CVSS severity of CVE-2014-6271?

CVE-2014-6271 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2014-6271?

CVE-2014-6271 has an EPSS score of 100.00% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2014-6271?

Upgrade bash on debian 11 to 4.3-9.1 or later. Fixes are available for 2 affected products.

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

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

Related Vulnerabilities

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

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2019-16920	Critical	9.8	100%	KEV	-
CVE-2022-44877	Critical	9.8	100%	KEV	Fix
CVE-2020-8515	Critical	9.8	100%	KEV	-
CVE-2020-9054	Critical	9.8	100%	KEV	Fix
CVE-2024-4577	Critical	9.8	100%	KEV + Ransom	Fix

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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.