CVE-2014-6271

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-01-28), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 100%CVSS: 9.8Exploit: cisa kev · ssvc active · Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

A fix is available — apply it.

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 v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
100%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

September 24, 2014

Last Modified

June 17, 2026

Advisory Details (6)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

linux.oracle.com | ELSA-2014-1294

http://linux.oracle.com/errata/ELSA-2014-1294.html
generic

linux.oracle.com | ELSA-2014-1293

http://linux.oracle.com/errata/ELSA-2014-1293.html
generic

lcamtuf's old blog: Quick notes about the bash bug, its impact, and the fixes so far

http://lcamtuf.blogspot.com/2014/09/quick-notes-about-bash-bug-its-impact.html
generic

CEC Juniper Community

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673
generic

JVN#55667175: QNAP QTS vulnerable to OS command injection

http://jvn.jp/en/jp/JVN55667175/index.html
generic

Mageia Advisory: MGASA-2014-0388 - Updated bash packages fix CVE-2014-6271

http://advisories.mageia.org/MGASA-2014-0388.html

Vendor Advisories for CVE-2014-6271(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntubash-static (4.3-7ubuntu1.1) @ trusty2026-09-19ubuntu
redhatrhev-hypervisor6-0:6.5-20140930.1.el6ev2014-10-02redhat
redhatbash-0:4.1.2-15.el6_4.12014-09-24redhat
redhatbash-0:4.1.2-15.el6_5.1.sjis.12014-09-24redhat
redhatbash-0:4.2.45-5.el7_0.22014-09-24redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
bash—4.3-9.1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
bash—4.3-9.1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
bash—4.3-9.1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
bash—4.3-9.1—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
bash4.1-34.1-3+deb6u1—
Debian:7(1)
PackageVulnerable rangeFixed inDependents
bash4.2+dfsg-0.14.2+dfsg-0.1+deb7u1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 84× in last 7d / 356× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 1,332 total refreshes for this CVE.

  1. 2026-09-19 13:33 UTCVendor advisory
  2. 2026-09-19 13:33 UTCGHSA enrichment
  3. 2026-09-19 09:21 UTCVendor advisory
  4. 2026-09-19 09:21 UTCGHSA enrichment
  5. 2026-09-19 05:04 UTCVendor advisory
  6. 2026-09-19 05:04 UTCGHSA enrichment
  7. 2026-09-19 00:52 UTCVendor advisory
  8. 2026-09-19 00:51 UTCGHSA enrichment
  9. 2026-09-18 20:39 UTCVendor advisory
  10. 2026-09-18 20:39 UTCGHSA enrichment
  11. 2026-09-18 19:20 UTCCISA KEV update
  12. 2026-09-18 16:27 UTCVendor advisory
  13. 2026-09-18 16:27 UTCGHSA enrichment
  14. 2026-09-18 14:15 UTCCISA KEV update
  15. 2026-09-18 12:14 UTCVendor advisory
  16. 2026-09-18 12:14 UTCGHSA enrichment
  17. 2026-09-18 08:00 UTCVendor advisory
  18. 2026-09-18 08:00 UTCGHSA enrichment
  19. 2026-09-18 03:48 UTCVendor advisory
  20. 2026-09-18 03:48 UTCGHSA enrichment
  21. 2026-09-17 23:36 UTCVendor advisory
  22. 2026-09-17 23:36 UTCGHSA enrichment
  23. 2026-09-17 19:24 UTCVendor advisory
  24. 2026-09-17 19:24 UTCGHSA enrichment
  25. 2026-09-17 15:12 UTCVendor advisory
Show 75 more
  1. 2026-09-17 15:12 UTCGHSA enrichment
  2. 2026-09-17 11:00 UTCVendor advisory
  3. 2026-09-17 11:00 UTCGHSA enrichment
  4. 2026-09-17 06:48 UTCVendor advisory
  5. 2026-09-17 06:48 UTCGHSA enrichment
  6. 2026-09-17 02:36 UTCVendor advisory
  7. 2026-09-17 02:35 UTCGHSA enrichment
  8. 2026-09-16 22:21 UTCVendor advisory
  9. 2026-09-16 22:21 UTCGHSA enrichment
  10. 2026-09-16 18:08 UTCVendor advisory
  11. 2026-09-16 18:08 UTCGHSA enrichment
  12. 2026-09-16 14:10 UTCCISA KEV update
  13. 2026-09-16 13:56 UTCVendor advisory
  14. 2026-09-16 13:56 UTCGHSA enrichment
  15. 2026-09-16 09:44 UTCVendor advisory
  16. 2026-09-16 09:44 UTCGHSA enrichment
  17. 2026-09-16 05:31 UTCVendor advisory
  18. 2026-09-16 05:31 UTCGHSA enrichment
  19. 2026-09-16 01:20 UTCVendor advisory
  20. 2026-09-16 01:19 UTCGHSA enrichment
  21. 2026-09-15 21:04 UTCVendor advisory
  22. 2026-09-15 21:04 UTCGHSA enrichment
  23. 2026-09-15 16:52 UTCVendor advisory
  24. 2026-09-15 16:52 UTCGHSA enrichment
  25. 2026-09-15 12:40 UTCVendor advisory
  26. 2026-09-15 12:40 UTCGHSA enrichment
  27. 2026-09-15 08:28 UTCVendor advisory
  28. 2026-09-15 08:28 UTCGHSA enrichment
  29. 2026-09-15 04:16 UTCVendor advisory
  30. 2026-09-15 04:16 UTCGHSA enrichment
  31. 2026-09-15 00:03 UTCVendor advisory
  32. 2026-09-15 00:03 UTCGHSA enrichment
  33. 2026-09-14 19:51 UTCVendor advisory
  34. 2026-09-14 19:51 UTCGHSA enrichment
  35. 2026-09-14 19:24 UTCCISA KEV update
  36. 2026-09-14 15:39 UTCVendor advisory
  37. 2026-09-14 15:39 UTCGHSA enrichment
  38. 2026-09-14 11:27 UTCVendor advisory
  39. 2026-09-14 11:27 UTCGHSA enrichment
  40. 2026-09-14 07:15 UTCVendor advisory
  41. 2026-09-14 07:15 UTCGHSA enrichment
  42. 2026-09-14 03:03 UTCVendor advisory
  43. 2026-09-14 03:03 UTCGHSA enrichment
  44. 2026-09-13 22:51 UTCVendor advisory
  45. 2026-09-13 22:51 UTCGHSA enrichment
  46. 2026-09-13 18:39 UTCVendor advisory
  47. 2026-09-13 18:39 UTCGHSA enrichment
  48. 2026-09-13 14:27 UTCVendor advisory
  49. 2026-09-13 14:27 UTCGHSA enrichment
  50. 2026-09-13 10:15 UTCVendor advisory
  51. 2026-09-13 10:15 UTCGHSA enrichment
  52. 2026-09-13 06:03 UTCVendor advisory
  53. 2026-09-13 06:03 UTCGHSA enrichment
  54. 2026-09-13 01:51 UTCVendor advisory
  55. 2026-09-13 01:51 UTCGHSA enrichment
  56. 2026-09-12 21:39 UTCVendor advisory
  57. 2026-09-12 21:39 UTCGHSA enrichment
  58. 2026-09-12 17:27 UTCVendor advisory
  59. 2026-09-12 17:27 UTCGHSA enrichment
  60. 2026-09-12 13:15 UTCVendor advisory
  61. 2026-09-12 13:15 UTCGHSA enrichment
  62. 2026-09-12 09:03 UTCVendor advisory
  63. 2026-09-12 09:03 UTCGHSA enrichment
  64. 2026-09-12 04:51 UTCVendor advisory
  65. 2026-09-12 04:51 UTCGHSA enrichment
  66. 2026-09-12 00:39 UTCVendor advisory
  67. 2026-09-12 00:39 UTCGHSA enrichment
  68. 2026-09-11 20:27 UTCVendor advisory
  69. 2026-09-11 20:27 UTCGHSA enrichment
  70. 2026-09-11 18:49 UTCCISA KEV update
  71. 2026-09-11 16:15 UTCVendor advisory
  72. 2026-09-11 16:15 UTCGHSA enrichment
  73. 2026-09-11 12:03 UTCVendor advisory
  74. 2026-09-11 12:03 UTCGHSA enrichment
  75. 2026-09-11 07:51 UTCVendor advisory

Publicly available exploits

(10 references)

Working exploit code is in the public domain (1 Metasploit module) (3 GitHub PoCs) (6 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCJ0hnTh3Kn1ght/CVE-2014-6271
    First seen Jul 1, 2023

    Exploitation of "Shellshock" Vulnerability. Remote code execution in Apache with mod_cgi

    Open source ↗
  • GitHub PoCb4keSn4ke/CVE-2014-6271
    First seen Jul 29, 2021

    Shellshock exploit aka CVE-2014-6271

    Open source ↗
  • Exploit-DBEDB-42938✓ verified
    First seen Oct 2, 2017

    Qmail SMTP - Bash Environment Variable Injection (Metasploit)

    Open source ↗
  • Exploit-DBEDB-40938✓ verified
    First seen Dec 18, 2016

    RedStar 3.0 Server - 'Shellshock' 'BEAM' / 'RSSMON' Command Injection

    Open source ↗
  • GitHub PoCopsxcq/exploit-CVE-2014-6271
    First seen Dec 7, 2016

    Shellshock exploit + vulnerable environment

    Open source ↗
  • Exploit-DBEDB-40619
    First seen Oct 21, 2016

    TrendMicro InterScan Web Security Virtual Appliance - 'Shellshock' Remote Command Injection

    Open source ↗
  • Exploit-DBEDB-39918✓ verified
    First seen Jun 10, 2016

    IPFire - 'Shellshock' Bash Environment Variable Command Injection (Metasploit)

    Open source ↗
  • Exploit-DBEDB-38849✓ verified
    First seen Dec 2, 2015

    Advantech Switch - 'Shellshock' Bash Environment Variable Command Injection (Metasploit)

    Open source ↗
  • Metasploitexploit/linux/http/advantech_switch_bash_env_exec✓ verified
    First seen Dec 1, 2015

    Advantech Switch Bash Environment Variable Code Injection (Shellshock)

    Open source ↗
  • Exploit-DBEDB-37816
    First seen Aug 18, 2015

    Cisco Unified Communications Manager - Multiple Vulnerabilities

    Open source ↗

Past incidents using this CVE

(1)

This CVE was central to one or more publicly-documented breaches. Each card links to authoritative reporting at the time of the incident.

  • Shellshock (bash)Sep 2014

    GNU bash environment-variable parsing flaw allowed remote command execution via CGI scripts, SSH, DHCP and Git. Affected millions of Unix systems.

    Source: The Register

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2014-6271?
CVE-2014-6271 is a critical vulnerability published on September 24, 2014. 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 modcgi and modcgid…
When was CVE-2014-6271 disclosed?
CVE-2014-6271 was first published in the National Vulnerability Database on September 24, 2014, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2014-6271 actively exploited?
Yes. CISA added CVE-2014-6271 to the Known Exploited Vulnerabilities catalog on January 28, 2022, affecting GNU Bourne-Again Shell (Bash). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2014-6271?
CVE-2014-6271 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2014-6271?
CVE-2014-6271 affects GNU Bourne-Again Shell (Bash). The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2014-6271?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2014-6271, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2014-6271

Explore →

Is Your Infrastructure Affected by CVE-2014-6271?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs