HIGH KEV
bash: incorrect parsing of function definitions with nested command substitutions
Published Sep 30, 2014 ·Due Oct 23, 2025
8.8
HIGHCVSS 3.1
EPSS 99.60%
Description
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.
Affected products
No data.
OR
- 1.14.0
- 1.14.1
- 1.14.2
- 1.14.3
- 1.14.4
- 1.14.5
- 1.14.6
- 1.14.7
- 2.0
- 2.01
- 2.01.1
- 2.02
- 2.02.1
- 2.03
- 2.04
- 2.05
- 2.05
- 2.05
- 3.0
- 3.0.16
- 3.1
- 3.2
- 3.2.48
- 4.0
- 4.0
- 4.1
- 4.2
- 4.3
No data.
Red Hat Enterprise Linux 4
bash
Not affected
Red Hat Enterprise Linux 5
bash
Not affected
Red Hat Enterprise Linux 6
bash
Not affected
Red Hat Enterprise Linux 7
bash
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | bash | Not affected | n/a |
| Red Hat Enterprise Linux 5 | bash | Not affected | n/a |
| Red Hat Enterprise Linux 6 | bash | Not affected | n/a |
| Red Hat Enterprise Linux 7 | bash | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat no longer considers this bug to be a security issue. The change introduced in bash errata RHSA-2014:1306, RHSA-2014:1311 and RHSA-2014:1312 removed the exposure of the bash parser to untrusted input, mitigating this problem to a bug without security impact.
Metrics
No CVSS v4.0 score for this CVE.
8.8 HIGH CISA ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
10.0 HIGH NVD
AV:N/AC:L/Au:N/C:C/I:C/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete
Listed in CISA KEV KEV
Date Added
Oct 2, 2025
Patch Due
Oct 23, 2025
Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Oct 2, 2025 · SSVC 2.0.3
99.60% 0.99603
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.99603
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 99.60% (0.99603) | 99.95th | v5 (v2026.06.15) |
| Jun 15, 2026 | 99.62% (0.99621) | 99.94th | v5 (v2026.06.15) |
| May 22, 2026 | 91.88% (0.91877) | 99.70th | v4 (v2025.03.14) |
| Oct 24, 2025 | 90.48% (0.90482) | 99.58th | v4 (v2025.03.14) |
| Oct 3, 2025 | 91.61% (0.91613) | 99.67th | v4 (v2025.03.14) |
| Sep 16, 2025 | 86.19% (0.86188) | 99.36th | v4 (v2025.03.14) |
| Mar 17, 2025 | 89.22% (0.89223) | 99.52th | v4 (v2025.03.14) |
| Dec 12, 2024 | 97.35% (0.97346) | 99.92th | v3 (v2023.03.01) |
| Jun 26, 2024 | 97.30% (0.97296) | 99.87th | v3 (v2023.03.01) |
| Dec 15, 2023 | 97.34% (0.97345) | 99.87th | v3 (v2023.03.01) |
| Jul 21, 2023 | 97.36% (0.97356) | 99.83th | v3 (v2023.03.01) |
| Mar 7, 2023 | 97.40% (0.97400) | 99.83th | v3 (v2023.03.01) |
| Mar 6, 2023 | 62.39% (0.62385) | 98.96th | v2 (v2022.01.01) |
| Feb 4, 2022 | 62.39% (0.62385) | 98.71th | v2 (v2022.01.01) |
Weaknesses (2)
References (115)
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Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner debian
Published Sep 30, 2014
Updated Dec 30, 2025
Reserved Sep 9, 2014
Link CVE-2014-6278
CISA Vulnrichment
Updated Oct 2, 2025