Servers and applications
CVE-2014-6271
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…
Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 28 Jan 2022.
- Severity
- Critical 9.8
- Published
- 24 Sept 2014
- Last changed
- 17 Jun 2026
- Added to UpHeron
- 1 Nov 2026
- Exploit chance
- 100% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 12 Nov 2026
- Weakness
- OS command injection (CWE-78)
- Attack
- Over the network · No login needed · No user action needed
- Attacker can
- Read data · Change data · Take it down
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Sources
- 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.
Affected software
| Software | Affected versions |
|---|---|
F5 BIG-IPServers and applications · cpe:a:f5:big-ip_access_policy_manager |
|
F5 BIG-IPServers and applications · cpe:a:f5:big-ip_local_traffic_manager |
|
Known exploited
- CISA name
- GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability
- Required action
- Apply updates per vendor instructions.
- Due for US agencies
- 28 Jul 2022
- Used in ransomware
- Not known