CVE-2014-6277

critical

Published 2014-09-27 · Modified 2026-05-06

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CVSS v3

—

CVSS v4 NEW

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not yet in upstream

VIR risk

10.0

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 code or cause a denial of service (uninitialized memory access, and untrusted-pointer read and write operations) 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 and CVE-2014-7169.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-36933 remote linux verified

fdiskyou · 2014-09-29

dhclient 4.1 - Bash Environment Variable Command Injection (Shellshock)

Source code queued for fetch — refresh in a moment.

EDB-35081 dos linux verified

Michal Zalewski · 2014-10-27

Binary File Descriptor Library (libbfd) - Out-of-Bounds Crash

Source code queued for fetch — refresh in a moment.

EDB-34860 remote linux

@0x00string · 2014-10-02

GNU bash 4.3.11 - Environment Variable dhclient

Source code queued for fetch — refresh in a moment.

OS impact

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`4.3.027-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`4.3-9.2`
sid	Fixed	`4.3-9.2`
forky	Fixed	`4.3-9.2`
bullseye	Fixed	`4.3-9.2`
bookworm	Fixed	`4.3-9.2`

Application impact

Vendor	Product	Versions
gnu	bash	`1.14.0`
gnu	bash	`1.14.1`
gnu	bash	`1.14.2`
gnu	bash	`1.14.3`
gnu	bash	`1.14.4`
gnu	bash	`1.14.5`
gnu	bash	`1.14.6`
gnu	bash	`1.14.7`
gnu	bash	`2.0`
gnu	bash	`2.01`
gnu	bash	`2.01.1`
gnu	bash	`2.02`
gnu	bash	`2.02.1`
gnu	bash	`2.03`
gnu	bash	`2.04`
gnu	bash	`2.05`
gnu	bash	`3.0`
gnu	bash	`3.0.16`
gnu	bash	`3.1`
gnu	bash	`3.2`
gnu	bash	`3.2.48`
gnu	bash	`4.0`
gnu	bash	`4.1`
gnu	bash	`4.2`
gnu	bash	`4.3`

References

CWEs

CWE-78

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.