SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

CVE-2014-6277

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…

EXPLOIT ×3 ✓HIGH 10.0EPSS 64.3%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 64.3%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

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.

CVSS 2.0
10.0 HIGHAV:N/AC:L/Au:N/C:C/I:C/A:C
EPSS
64.33% probability · 99th percentile
Public exploits
3 in Exploit-DB · verified · first 29 September 2014
CISA KEV
Not listed
Weakness
CWE-78
Affected
gnu/bash
Source
security@debian.org
EPSS trend
0%35%70%20 September 2026: 69.77%3 October 2026: 64.33%4 November 2026: 64.33%20 September 20264 November 2026

EPSS moved from 69.8% on 20 September 2026 to 64.3% on 4 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

Public exploits (3)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-IDTitleTypePublishedVerified
EDB-35081source ↗Binary File Descriptor Library (libbfd) - Out-of-Bounds Crashlinux · Michal Zalewskidos27 October 2014yes
EDB-34860source ↗GNU bash 4.3.11 - Environment Variable dhclientlinux · @0x00stringremote2 October 2014no
EDB-36933source ↗dhclient 4.1 - Bash Environment Variable Command Injection (Shellshock)linux · fdiskyouremote29 September 2014yes

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.