How severe is CVE-2014-6271?

CVE-2014-6271 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2014-6271?

Affected package information for CVE-2014-6271 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2014-6271?

No fixed version has been published for CVE-2014-6271 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2014-6271 actively exploited in the wild?

Yes. There are 78 known exploit references for CVE-2014-6271, including 21 documented proof-of-concept exploits on Exploit-DB and 42 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2014-6271?

CVE-2014-6271 has an EPSS (Exploit Prediction Scoring System) score of 94.2%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2014-6271 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2014-6271 (GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-01-28. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-07-28. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

CISA KEV·Added 2022-01-28 — agencies required to remediate by 2022-07-28

CVE-2014-6271

Q: Can O3 Security detect CVE-2014-6271 in my codebase?

Yes. O3 Security's Impact-Aware SCA scanner identifies CVE-2014-6271 across all affected ecosystems (multiple ecosystems), correlates it against your dependency graph, and uses function-level reachability to confirm whether the vulnerable code path is actually reachable in your application — eliminating false positives. You can scan your stack for CVE-2014-6271 directly from the O3 platform.

CRITICAL

Published

Sep 24, 2014

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

78 known

EPSS Exploitation Probability

via FIRST.org ↗

94.2%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-36504remotehardware

QNAP - Web Server Remote Code Execution via Bash Environment Variable Code Injection (Metasploit)

by Patrick Pellegrino · Mar 26, 2015

CVE-2014-6271

EPSS Exploitation Probability

Description

Frequently Asked Questions

Is CVE-2014-6271 in your stack?