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CVE-2014-6271

CRITICAL · CVSS 9.8CISA KEV: actively exploitedEPSS 100.0%EU EUVD: exploited

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.

Key facts

CVSS score
9.8 (v3.1)
Severity
CRITICAL
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-78
EPSS score
100.0% (100th percentile)
In CISA KEV
Yes, added January 28, 2022
In EU EUVD
Yes (EUVD-2014-6157)
Published
September 24, 2014
NVD last modified
June 17, 2026
Status
Analyzed

CISA Known Exploited Vulnerability

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

Added to the KEV catalog on January 28, 2022; federal remediation due July 28, 2022.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2014-6157 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 22, 2025.

View on the EU Vulnerability Database

Affected products

  • apple / mac os x
  • arista / eos
  • canonical / ubuntu linux
  • canonical / ubuntu linux
  • canonical / ubuntu linux
  • checkpoint / security gateway
  • citrix / netscaler sdx
  • citrix / netscaler sdx firmware
  • debian / debian linux
  • f5 / arx
  • f5 / arx firmware
  • f5 / big-ip access policy manager
  • f5 / big-ip access policy manager
  • f5 / big-ip advanced firewall manager
  • f5 / big-ip advanced firewall manager
  • f5 / big-ip analytics
  • f5 / big-ip analytics
  • f5 / big-ip application acceleration manager
  • f5 / big-ip application acceleration manager
  • f5 / big-ip application security manager
  • f5 / big-ip application security manager
  • f5 / big-ip edge gateway
  • f5 / big-ip global traffic manager
  • f5 / big-ip global traffic manager
  • f5 / big-ip link controller
  • f5 / big-ip link controller
  • f5 / big-ip local traffic manager
  • f5 / big-ip local traffic manager
  • f5 / big-ip policy enforcement manager
  • f5 / big-ip policy enforcement manager
  • f5 / big-ip protocol security module
  • f5 / big-ip wan optimization manager
  • f5 / big-ip webaccelerator
  • f5 / big-iq cloud
  • f5 / big-iq device
  • f5 / big-iq security
  • f5 / enterprise manager
  • f5 / traffix signaling delivery controller
  • f5 / traffix signaling delivery controller
  • f5 / traffix signaling delivery controller
  • f5 / traffix signaling delivery controller
  • f5 / traffix signaling delivery controller
  • gnu / bash
  • ibm / flex system v7000
  • ibm / flex system v7000 firmware
  • ibm / infosphere guardium database activity monitoring
  • ibm / infosphere guardium database activity monitoring
  • ibm / infosphere guardium database activity monitoring
  • ibm / pureapplication system
  • ibm / pureapplication system

and 258 more…

Certified products that may be affected

32 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

See all 32 in the Security Certifications Explorer.

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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