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Vulnerability details

CVE-2014-6271

Actively exploited
GNU Bourne-Again Shell (Bash)
CVSS 3.1
9.8Critical

Official 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.

CVSS scores

ScoreVersionSourceVector
9.8Critical 3.1 CISA ADP / Vulnrichment (CISA-ADP) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
No product information recorded.

References and advisories

171
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Details

Published
2014-09-24
Last updated
2025-10-22
State
Published
Assigner (CNA)
debian
Kolun priority
90 · Critical

CISA KEV catalog

Date added
2022-01-28
Due date
2022-07-28
Used in ransomware
Unknown

Exploit prediction (EPSS)

99.99%
Probability of exploitation in 30 days
99.9%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
Active
Technical impact
Total

Weaknesses (CWE)

  • CWE-78
    Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')