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CVE-2014-6278· NVD / CVE Program· CNA debian

GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote att

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.

HighCVSS 8.8 · v3.1KEVWeaponized Fix available
Published
Sep 30, 2014
Updated
Jun 16, 2026
EPSS
99.6% · 100th percentile
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Report tools

JSON

Action score

95

Now

Patch today or shut off access.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
30 / 30 · 99.6%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Oct 2, 2025. That signals real attacks, not theory.

Remediation deadline for government agencies: Oct 23, 2025.

Affected systems

VendorProduct
gnubash

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • gnu bash1.14.0
  • gnu bash1.14.1
  • gnu bash1.14.2
  • gnu bash1.14.3
  • gnu bash1.14.4
  • gnu bash1.14.5
  • gnu bash1.14.6
  • gnu bash1.14.7
  • gnu bash2.0
  • gnu bash2.01
  • gnu bash2.01.1
  • gnu bash2.02
  • gnu bash2.02.1
  • gnu bash2.03
  • gnu bash2.04
  • gnu bash2.05
  • gnu bash3.0
  • gnu bash3.0.16
  • gnu bash3.1
  • gnu bash3.2

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12bashbefore 4.3-9.24.3-9.2
openSUSE:Tumbleweedbashbefore 7.0-92.17.0-92.1
SUSE:Linux Enterprise Desktop 12 SP1bashbefore 4.2-82.14.2-82.1

Same product

gnu: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-7169GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed function definitions in the values of environment variablKEV
    99Now
  • CVE-2014-6271GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attacKEV
    99Now
  • CVE-2014-7186The redirection implementation in parse.y in GNU Bash through 4.3 bash43-026 allows remote attackers to cause a denial of service (out-of-bo
    61This week
  • CVE-2014-6277GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote att
    61This week
  • CVE-2014-7187Off-by-one error in the read_token_word function in parse.y in GNU Bash through 4.3 bash43-026 allows remote attackers to cause a denial of
    59Plan
  • CVE-2016-7543Bash before 4.4 allows local users to execute arbitrary commands with root privileges via crafted SHELLOPTS and PS4 environment variables.
    33Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Debian:bash4.3-9.2 · Debian:12Package registry (OSV)
openSUSE:bash7.0-92.1 · openSUSE:TumbleweedPackage registry (OSV)
SUSE:bash4.2-82.1 · SUSE:Linux Enterprise Desktop 12 SP1Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×3
  • Exploit-DB entry ×5

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrywebapps2016-06-06
Exploit-DB entryremote2016-03-16
Exploit-DB entryremote2014-10-06
Exploit-DB entryremote2014-09-29
Exploit-DB entryremote2014-10-02
Metasploit moduleauxiliary/scanner/http/apache_mod_cgi_bash_envApache mod_cgi Bash Environment Variable Injection (Shellshock) Scannerauxiliary2014-09-24
Metasploit moduleexploit/multi/http/apache_mod_cgi_bash_env_execApache mod_cgi Bash Environment Variable Code Injection (Shellshock)exploit2014-09-24
Metasploit moduleexploit/multi/http/cups_bash_env_execCUPS Filter Bash Environment Variable Code Injection (Shellshock)exploit2014-09-24

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-6 d
  2. First PoC-1 d
  3. Published
  4. CISA KEV+4020 d
  5. TodaySep 29, 2026+4383 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
const host = req.body.host;exec("ping -c 1 " + host, onResult);

Fixed

ts
const host = req.body.host;if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);execFile("ping", ["-c", "1", host], onResult);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records