Threat Intelligence / CVE / CVE-2014-6271

CVE-2014-6271 — Gnu Bash

CISA KEV
CVSS v3.1 9.8 (CRITICAL) · EPSS 99.9% (higher than 99.9% of all scored CVEs) · Priority 9/10 · Published 2014-09-24

As of 2025-10-22, CVE-2014-6271 is a CRITICAL-severity vulnerability in Gnu Bash, CVSS v3.1 9.8, EPSS 99.9% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-01-28), with a US federal remediation deadline of 2022-07-28. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2014-6271, most recently “Chinese-Speaking Operator "Nie" Uses SecFlow AI Orchestration Framework (Claude, Qwen, DeepSeek) and GLUTTON Steganographic Webshell in Multi-Country Espionage Campaign”.

Last updated: 2025-10-22

What is CVE-2014-6271?

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.

The record classifies CVE-2014-6271 under weakness class CWE-78. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 30 affected-product entries are recorded, across 6 vendors, listed below. The identifier was first published 4372 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
99.9% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV
Listed since 2022-01-28, federal remediation deadline 2022-07-28
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2014-09-24, last modified 2025-10-22

Is CVE-2014-6271 being exploited?

CISA added CVE-2014-6271 to the Known Exploited Vulnerabilities catalog on 2022-01-28, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2022-07-28 under BOD 22-01. Weaponised exploit code for CVE-2014-6271 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2014/CVE-2014-6271.yaml). It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.

Affected products and versions

Showing 25 of 30 recorded product entries.

How to fix CVE-2014-6271

The record marks a vendor fix as available for CVE-2014-6271. Patch reference: https://bugzilla.redhat.com/show_bug.cgi?id=1141597. Vendor advisory: http://jvn.jp/en/jp/JVN55667175/index.html. Because CVE-2014-6271 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2022-07-28. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2014-6271

1 tracked threat in the Threadlinqs corpus references CVE-2014-6271, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Exploit and proof of concept

Mailing list and disclosure

Other references

Showing 9 of 19 recorded references.

Full detection coverage & IOCs for threats exploiting CVE-2014-6271 are available via the Threadlinqs MCP server (Purple tier). View plans →

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