{"id":"CVE-2014-6271","published":"2014-09-24T18:48:04Z","modified":"2026-06-17T00:12:48Z","title":"GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability","vendor":"GNU","product":"Bourne-Again Shell (Bash)","tier":"core","eol":null,"description":{"text":"GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code 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, aka \"ShellShock.\"  NOTE: the original fix for this issue was incorrect; CVE-2014-7169 has been assigned to cover the vulnerability that is still present after the incorrect fix.","provenance":"source","from":"NVD"},"summary":{"text":"GNU Bash through version 4.3 mishandles trailing strings after function definitions in environment variable values, a flaw in the Bourne-Again Shell (Bash) component that is known as ShellShock. An attacker who can supply a crafted environment across a privilege boundary, such as through the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in Apache HTTP Server, or scripts run by certain DHCP clients, can execute arbitrary code, and no authentication or user interaction is needed.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:53:55Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.99999,"percentile":0.99993,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2022-01-28","dueDate":"2022-07-28","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2014-6271","provenance":"source"},"vulncheckKev":{"dateAdded":"2014-09-30","exploitedFirstSeen":"2014-09-30","ransomware":false,"evidence":[{"url":"https://www.bitdefender.com/blog/hotforsecurity/shellshock-bug-exploited-in-the-wild-now-patched-by-apple/","date":"2014-09-30"},{"url":"https://www.trendmicro.com/en_us/research/14/k/bashlite-affects-devices-running-on-busybox.html","date":"2014-11-13"},{"url":"https://www.virusbulletin.com/virusbulletin/2018/03/vb2017-paper-router-all-evil-more-just-default-passwords-and-silly-scripts/","date":"2018-03-01"},{"url":"https://blog.talosintelligence.com/2019/04/seaturtle.html","date":"2019-04-17"},{"url":"https://www.lacework.com/blog/spytech-necro-keksecs-latest-python-malware/","date":"2021-10-13"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-01-28"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-12-08&host_type=src&vulnerability=cve-2014-6271","date":"2023-12-08"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-12-27&host_type=src&vulnerability=cve-2014-6271","date":"2023-12-27"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-12-28&host_type=src&vulnerability=cve-2014-6271","date":"2023-12-28"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2023-12-29&host_type=src&vulnerability=cve-2014-6271","date":"2023-12-29"}],"evidenceTotal":46,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev 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","confidence":"medium","confidenceNote":"CTID KEV capability group \"code execution\" is generic"}],"reports":[{"id":"SRC-65ab06ae92274f14e50e","title":"DNS Hijacking Abuses Trust In Core Internet Service","publisher":"blog.talosintelligence.com","url":"https://blog.talosintelligence.com/seaturtle/","date":"2019-04-17","mentions":[{"quote":"CVE-2014-6271: RCE affecting GNU bash system, specifically the SMTP (this was part of the Shellshock CVEs)","start":8624,"end":8730},{"quote":"PHP code injection vulnerability affecting phpMyAdminSID: 2281CVE-2014-6271: RCE affecting GNU bash system, specific the SMTP (this was part of the Shellshock CVEs)SID: 31975 - 31978, 31985, 32038, 32039, 32041 - 32043, 32069, 32335, 32336CVE-2017-3881: RCE for Cisco switchesSID: 41909 -","start":20040,"end":20328}]},{"id":"SRC-cac5a64d298755b4fcba","title":"Industrial Cybersecurity Threat 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