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CVE-2016-7543

21
FAUCET Score

CVE-2016-7543 is a high-severity vulnerability affecting Bash versions prior to 4.4, allowing local users to achieve root privileges through crafted SHELLOPTS and PS4 environment variables. With a CVSS v3 score of 8.4, this vulnerability presents a significant risk due to its low attack complexity and high impact on confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.3CPE matchmatch criteria
cpe:2.3:a:gnu:bash:*:*:*:*:*:*:*:*
23CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
24CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
25CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.4HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.5
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.58%
Probability of exploitation in next 30 days
EPSS Percentile
44.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0058 is in the 65th percentile among its peer group of 3,235 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.5 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: bash-0:4.1.2-48.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: bash-0:4.2.46-28.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: bash

Vendor Advisories (1)

redhatCVE-2016-7543Moderate

bash: Specially crafted SHELLOPTS+PS4 variables allows command substitution

Sep 16, 2016

References

rhn.redhat.com / errata/RHSA-2017-0725.html
access.redhat.com / errata/RHSA-2017:1931
h20566.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/F7XOQSHU63Y357NHU5FPTFBM6I3YOCQB
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/OU3C756YPHDAAPFX76UGZBAQQQ5UMHS5
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/Z2VRBSIPZDZ75ZQ2DLITHUIDW4W26KVR
lists.gnu.org / archive/html/bug-bash/2016-09/msg00018.html
PatchVendor Advisory
security.gentoo.org / glsa/201701-02
Third Party Advisory
openwall.com / lists/oss-security/2016/09/26/9
Mailing ListThird Party Advisory
securityfocus.com / bid/93183
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037812