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CVE-2014-6271

9.8, critical Known exploited

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

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
100% higher than 99.9% of scored CVEs
Exploitation
Confirmed in the wild
Published
24 Sept 201412 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 28 Jan 2022. US federal agencies had to remediate by 28 Jul 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

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.

Details

Vendor
GNU and 16 more
Product
Bash
Weakness
CWE-78 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
security@debian.org

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

References 171

Exploit code 17

9 more

Patches and fixes 1

Advisories 151

143 more

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other GNU CVEs

Every GNU CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-24061 GNU InetUtils Argument Injection Vulnerability KEV EPSS 99% 9.8, critical
  • CVE-2023-4911 GNU C Library Buffer Overflow Vulnerability KEV EPSS 64% 7.8, high
  • CVE-2014-6278 GNU Bash OS Command Injection Vulnerability KEV EPSS 100% 8.8, high
  • CVE-2014-7169 GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability KEV EPSS 100% 9.8, critical

Beyond this page

Is CVE-2014-6271 in your network?

This page tells you how dangerous CVE-2014-6271 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2014-6271 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.