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CVE-2014-6278

GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote attackers to execute…

Not rated yet Known exploited
Severity
Not rated yet
No source has published a CVSS score yet
Exploit chance (EPSS)
99.67%
Chance of exploitation in the next 30 days. Higher than 99.95% of scored vulnerabilities.
Known exploited
Yes
In CISA's catalog since Oct 2, 2025
Weakness
—
Not classified
Fix
None yet
No fixed version published
Exploited in the wild. GNU Bash OS Command Injection Vulnerability (GNU GNU Bash). Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Due for U.S. federal agencies by Oct 23, 2025.

Description

GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote attackers to execute arbitrary commands 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. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-6271, CVE-2014-7169, and CVE-2014-6277.

How to fix

No fixed version has been published yet. Until one is, remove or replace the package, or turn off or isolate the affected feature. This page updates when a fix ships.

References

Advisories

Fixes and patches

Issue reports

Write-ups

Other links

Timeline

  1. Published
  2. Added to CISA's Known Exploited Vulnerabilities catalog
  3. Remediation due for U.S. federal agencies
  4. Last updated by the source
  5. Latest EPSS score
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