CVE-2014-6271

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM 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 — 4 sources updated this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 100%CVSS: 9.8Exploit: NoneExposed: 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(medium)
EPSS
100.0%
KEV
⚠ Exploited

Published

September 24, 2014

Last Modified

April 22, 2026

Advisory Details (6)

Auto-updated May 12, 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) @ trusty2026-07-12ubuntu
redhatrhev-hypervisor6-0:6.5-20140930.1.el6ev2014-10-02redhat
redhatbash-0:4.1.2-15.el6_5.1.sjis.12014-09-24redhat
redhatbash-0:4.1.2-15.el6_4.12014-09-24redhat
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.

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 120× in last 7d / 522× 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 772 total refreshes for this CVE.

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

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

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 April 22, 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

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