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CVE-2014-6271: GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2014-6271
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute code.

CSIRTS triage

vendor: GNUproduct: BashCode injectionaffected: through 4.3
What
GNU Bash processes trailing strings after function definitions in the values of environment variables, allowing remote attackers to execute code.
Who is affected
Deployments of GNU Bash versions through 4.3.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Upgrade to a patched version of Bash.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-01-28
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2014-6271

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2014-6271coverage & exploitation statusNVD · CVE.org

Recent advisories for GNU Bourne-Again Shell

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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