CVE-2014-6271KEV · OVERDUE

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

Critical · published September 24, 2014

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.8. It is confirmed in active exploitation. It sits in the 100.0th percentile for exploit probability.

1548
days past CISA
deadline
CVSS v3.1
9.8
EPSS
100%
Percentile
100.0
In the wild
Confirmed
What it is

🔥 The infamous ShellShock vulnerability in GNU Bash allows attackers to slip in remote code with a crafted environment variable — a serious blunder in the digital world! Think of it as a restaurant where a delivery driver can sneak in a box of goodies while being told they're just dropping off the regular order. If the chef isn’t careful, those sneaky ingredients could poison the entire batch! An attacker could exploit this vulnerability to execute arbitrary code remotely, potentially taking full control of the affected system. This can lead to data theft, service interruption, or even complete system takeover, making it a critical threat across various applications and servers.

Put simply

Think of it as a restaurant where a delivery driver can sneak in a box of goodies while being told they're just dropping off the regular order. If the chef isn’t careful, those sneaky ingredients could poison the entire batch! CVE-2014-6271 affects GNU Bash versions prior to 4.3, allowing attackers to execute code through trailing strings in environment variables, particularly in contexts like OpenSSH and Apache, where Bash is executed under privileged conditions.

What to do

An attacker could exploit this vulnerability to execute arbitrary code remotely, potentially taking full control of the affected system. This can lead to data theft, service interruption, or even complete system takeover, making it a critical threat across various applications and servers. Immediate action is vital! Patch to GNU Bash 4.3 or higher to mitigate this vulnerability, and ensure you apply the additional fix provided in CVE-2014-7169. Regularly review your environment variable configurations to prevent any exploit attempts. 🔒 You've got this! With swift action, you can secure your systems and earn your security hero badge! 🦸‍♂️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.99999 · 100.0th percentile
Published
2014-09-24T18:00Z
KEV added
2022-01-28 · due 2022-07-28
EPSS history
Timeline
  • 28 JAN 00:00Z
    Added to CISA KEV — remediate by Jul 28
    kev
  • 24 SEP 18:00Z
    GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute…
    cvelistv5