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CVE-2014-6278

8.8
High
KEV · Exploited in wildEPSS 100%Patch available

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.

exploited
Yes, in CISA KEV since 2 Oct 2025fix by 23 Oct 2025 (CISA deadline for US federal agencies)public exploit code
fix
Patch available see the advisory in the references
likelihood
EPSS 99.7%
Published 30 Sept 2014Analysed here 2 Nov 2026CVSS scored by CISA

do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

triage
server-sideruntimeWAF can block: partlyAV · networkCWE-78· OS Command Injection

Can a WAF block it? Partly. OS command injection puts shell syntax into the request. WAF rules catch common shell commands but miss encoded or unusual payloads.

Also consider: shlex/execve-style APIs

Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

cvss vector
attack vectornetworkattack complexitylowprivileges requirednoneuser interactionrequiredscopeunchangedconfidentialityhighintegrityhighavailabilityhigh
CVSS 3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
common questions

Is CVE-2014-6278 being exploited?

Yes. CVE-2014-6278 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2014-6278?

CVE-2014-6278 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2014-6278?

Yes. A fix has been recorded for CVE-2014-6278. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2014-6278 affect?

CVE-2014-6278 affects gnu:bash. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
gnu:bash

public exploits

Public exploit code: 5 on Exploit-DB · 3 Metasploit modules

Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.

cisa ssvc

exploitation
active
automatable
no
technical impact
total

Assessed by CISA 2 Oct 2025 (SSVC 2.0.3).

timeline

  1. 29 Sept 2014First public exploit or proof of concept
  2. 30 Sept 2014Published · 1 day later
  3. 2 Oct 2025Added to CISA KEV (exploited in the wild) · 4,020 days (about 11 years) later
  4. 2 Oct 2025CISA SSVC assessment: exploitation active · same day later
  5. 23 Oct 2025CISA remediation due date (US federal agencies) · 21 days later
  6. 30 Dec 2025CVE record last updated · 69 days (about 2 months) later
  7. 2 Nov 2026Analysed by vulneraibility.com · 307 days (about 10 months) later
how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
50 references in the CVE record: 28 advisories, 1 exploit, 21 links
  • Advisorymarc.info /?l=bugtraq&m=141577137423233&w=2
  • Advisorymarc.info /?l=bugtraq&m=142721162228379&w=2
  • Advisorymarc.info /?l=bugtraq&m=142358026505815&w=2
  • Advisoryjvn.jp /en/jp/JVN55667175/index.html
  • Advisorysecunia.com /advisories/60433
  • Advisorymarc.info /?l=bugtraq&m=141383026420882&w=2
  • Advisorymarc.info /?l=bugtraq&m=141585637922673&w=2
  • Advisorymarc.info /?l=bugtraq&m=141576728022234&w=2
Show 42 more

sources

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