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ExploitedIn CISA KEVFix available

CVE-2014-6271

Shellshock

Exploitation confirmed. First attested on 2022-01-28 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2014-09-2418:48CVE publishedNVD
  2. 2022-01-28Listed as exploited by GCVEGCVE
  3. 2022-01-28Exploitation first reportedCISA KEV
  4. 2022-01-28Added to the CISA KEV catalogCISA KEV
  5. 2025-02-0713:45SSVC exploitation set to activeCISA-ADP
  6. 2026-10-2319:23First public proof of conceptPoC-in-GitHub
  7. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2014-6271?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2014-6271?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Ibm qradar security information and event manager
BranchAffectedFixed in
7.1= 7.1.0no fix published
7.1= 7.1.1no fix published
7.1= 7.1.2no fix published
7.2= 7.2no fix published
7.2= 7.2.0no fix published
7.2= 7.2.1no fix published
7.2= 7.2.2no fix published
7.2= 7.2.3no fix published
7.2= 7.2.4no fix published
7.2= 7.2.5no fix published
7.2= 7.2.6no fix published
7.2= 7.2.7no fix published
Redhat enterprise linux server aus
BranchAffectedFixed in
5.6= 5.6no fix published
5.9= 5.9no fix published
6.2= 6.2no fix published
6.4= 6.4no fix published
6.5= 6.5no fix published
7.3= 7.3no fix published
7.4= 7.4no fix published
7.6= 7.6no fix published
7.7= 7.7no fix published
Ibm security access manager for web 7.0 firmware
BranchAffectedFixed in
7.0= 7.0.0.1no fix published
7.0= 7.0.0.2no fix published
7.0= 7.0.0.3no fix published
7.0= 7.0.0.4no fix published
7.0= 7.0.0.5no fix published
7.0= 7.0.0.6no fix published
7.0= 7.0.0.7no fix published
7.0= 7.0.0.8no fix published

71 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-15-344-01B CISA1 known affected

    Advantech EKI Vulnerabilities (Update B)

    Advantech EKI-132x platform devices: vers:all/*

  • ICSA-14-269-01A CISA9 known affected

    Bash Command Injection Vulnerability

    ABB ; Cisco ; Digi ; eWON ; Meinberg ; Moxa ; Red Lion; Siemens ABB Tropos 3000, 4000, 6000, & 7000 series routers: vers:all/* · ABB ; Cisco ; Digi ; eWON ; Meinberg ; Moxa ; Red Lion; Siemens ABB Ventyx NM EMS/SCADA on RHEL Ventyx: vers:all/* · ABB ; Cisco ; Digi ; eWON ; Meinberg ; Moxa ; Red Lion; Siemens Meinberg LANTIME: 4.x|5.x|6.x · +6 more

Full record on NVD

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-07-28
  2. Mitigation from the vendor CISA ICSA-15-344-01B · 1 productUpdate to the latest version. (http://support.advantech.com.tw/Support/SearchResult.aspx?keyword=EKI-132*&searchtabs=Firmware)
  3. Mitigation from the vendor CISA ICSA-14-269-01A · 9 productsThere are several functional mitigations for this vulnerability including upgrading to a new version of bash, replacing bash with an alternate shell, limiting access to vulnerable services, and/or filtering inputs to vulnerable services.
  4. Mitigation from the vendor CISA ICSA-14-269-01A · 9 productsPatches have been released to fix this vulnerability by major Linux vendors for affected versions
  5. Mitigation from the vendor CISA ICSA-14-269-01A · 9 productshowever, solutions for CVE-2014-6271 do not completely resolve the vulnerability. It is advised to install existing patches and pay attention for updated patches to address CVE-2014-7169.Vulnerability Summary for CVE-2014-7169 (http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-7169)
  6. Mitigation from the vendor CISA ICSA-14-269-01A · 9 products(https://www.cve.org/CVERecord?id=CVE-2014-7169)
  7. Mitigation from the vendor CISA ICSA-14-269-01A · 9 productsMany UNIX-like operating systems, including Linux distributions, BSD variants, and Apple Mac OS X include bash and are likely to be affected. Contact your respective Linux or Unix-based OS vendor(s) for updated information. A list of vendors can be found in CERT Vulnerability Note VU#252743.Vulnera…

Advisories and patches

Detection

read 2026-10-23 19:23 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
20 repositories, unverifieddlitz/bash-cve-2014-6271-fixesnpm/ansible-bashpocalypseryancnelson/patched-bash-4.3jblaine/cookbook-bash-CVE-2014-6271rrreeeyyy/cve-2014-6271-spec
PoC-in-GitHub

CISA Known Exploited Vulnerability

Date Added
2022-01-28
Patch Due Date
2022-07-28
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2014-09-24
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is 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 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.

Is CVE-2014-6271 actively exploited?

Yes. CVE-2014-6271 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-07-28.

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

CVE-2014-6271 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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