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
Exploited 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 services: Not assessed

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
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100CISA SSVC

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%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
100%
EPSS %ILE
99th
KEV
⚠ Exploited

CISA SSVCAttend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2014

Last Modified

June 17, 2026

Advisory Details (6)

Auto-updated Oct 7, 2026
Patch available.
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(2)

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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntubash (4.1-2ubuntu3.1) @ lucid2026-10-10ubuntu
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.

Affected Packages

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
bash—
  • every version up to 4.3-9.1: fixed in 4.3-9.1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
bash—
  • every version up to 4.3-9.1: fixed in 4.3-9.1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
bash—
  • every version up to 4.3-9.1: fixed in 4.3-9.1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
bash—
  • every version up to 4.3-9.1: fixed in 4.3-9.1
—
Debian:6.0(1)
PackageVulnerable rangeFix by version rangeDependents
bash4.1-3
  • every version up to 4.1-3+deb6u1: fixed in 4.1-3+deb6u1
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
bash4.2+dfsg-0.1
  • every version up to 4.2+dfsg-0.1+deb7u1: fixed in 4.2+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 82× in last 7d / 357× 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 1,579 total refreshes for this CVE.

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

Publicly available exploits

(10 references)

Working exploit code is in the public domain (1 Metasploit module) (9 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • 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 ↗
  • 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-35115✓ verified
    First seen Oct 29, 2014

    CUPS Filter - Bash Environment Variable Code Injection (Metasploit)

    Open source ↗
  • Exploit-DBEDB-34895✓ verified
    First seen Oct 6, 2014

    Bash CGI - 'Shellshock' Remote Command Injection (Metasploit)

    Open source ↗
  • Exploit-DBEDB-34896✓ verified
    First seen Oct 6, 2014

    Postfix SMTP 4.2.x < 4.2.48 - 'Shellshock' Remote Command Injection

    Open source ↗
  • Exploit-DBEDB-34900✓ verified
    First seen Oct 6, 2014

    Apache mod_cgi - 'Shellshock' Remote Command Injection

    Open source ↗
  • Exploit-DBEDB-34862✓ verified
    First seen Oct 2, 2014

    Pure-FTPd - External Authentication Bash Environment Variable Code Injection (Metasploit)

    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 product + 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 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 attention. A fix is available. Apply it.
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 affected packages EchelonGraph has on record, with version ranges, are listed in the Affected Packages section of this page.
How do I remediate CVE-2014-6271?
A fix for CVE-2014-6271 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2014-6271 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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