CVE DATABASE / CVE-2014-6271
CVE-2014-6271
GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability
Confirmed exploited in the wild. Added 2022-01-28.
Federal remediation due 2022-07-28.
Required action: Apply updates per vendor instructions.
Summary
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 3.1 breakdown
| Base score | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
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References
- http://advisories.mageia.org/MGASA-2014-0388.html
- http://archives.neohapsis.com/archives/bugtraq/2014-10/0101.html
- http://jvn.jp/en/jp/JVN55667175/index.html
- http://jvndb.jvn.jp/jvndb/JVNDB-2014-000126
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673
- http://lcamtuf.blogspot.com/2014/09/quick-notes-about-bash-bug-its-impact.html
- http://linux.oracle.com/errata/ELSA-2014-1293.html
- http://linux.oracle.com/errata/ELSA-2014-1294.html
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00028.html
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00029.html
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00034.html
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00037.html
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00040.html
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00044.html
- http://lists.opensuse.org/opensuse-security-announce/2014-09/msg00049.html
Data: NIST NVD + CISA KEV. NVD last modified 2026-04-22. Always verify against the vendor advisory before acting.