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 code.
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/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- advisories.mageia.org/MGASA-2014-0388.htmlThird Party Advisory
- archives.neohapsis.com/archives/bugtraq/2014-10/0101.htmlBroken LinkThird Party Advisory
- jvn.jp/en/jp/JVN55667175/index.htmlVendor Advisory
- jvndb.jvn.jp/jvndb/JVNDB-2014-000126Third Party AdvisoryVDB Entry
- kb.juniper.net/InfoCenter/index?page=content&id=JSA10673Third Party Advisory
- lcamtuf.blogspot.com/2014/09/quick-notes-about-bash-bug-its-impact.htmlExploitIssue Tracking
- linux.oracle.com/errata/ELSA-2014-1293.htmlThird Party Advisory
- linux.oracle.com/errata/ELSA-2014-1294.htmlThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2014-09/msg00028.htmlMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2014-09/msg00029.htmlMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2014-09/msg00034.htmlMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2014-09/msg00037.htmlMailing ListThird Party Advisory
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1552 days
- CVSS
- 9.8 CRITICAL
- EPSS (30-day exploit probability)
- 100.0% · top 1% of all CVEs
- Weakness
- CWE-78
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.