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CVE-2016-0634

28
FAUCET Score

CVE-2016-0634 is a high-severity vulnerability affecting GNU Bash 4.3, allowing remote authenticated users to execute arbitrary code. This occurs due to improper expansion of '\h' in the prompt string, enabling shell metacharacters placed in the hostname to be executed. The attack requires low privileges but has high impact, potentially leading to complete compromise of confidentiality, integrity, and availability. Currently, there is no public exploit code available, and the vulnerability shows no signs of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
4.3CPE matchmatch criteria
cpe:2.3:a:gnu:bash:4.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.02%
Probability of exploitation in next 30 days
EPSS Percentile
92.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0602 is in the 92nd percentile among its peer group of 1,162 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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 (4)

redhatpatch availablevia nvd_reference
View patch
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-2016-0634Moderate

bash: Arbitrary code execution via malicious hostname

Oct 16, 2015

References

rhn.redhat.com / errata/RHSA-2017-0725.html
access.redhat.com / errata/RHSA-2017:1931
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party AdvisoryVDB Entry
security.gentoo.org / glsa/201612-39
Third Party Advisory
openwall.com / lists/oss-security/2016/09/16/12
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/09/16/8
Mailing ListPatchThird Party Advisory
openwall.com / lists/oss-security/2016/09/18/11
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/09/19/7
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/09/20/1
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/09/27/9
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/09/29/27
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/10/07/6
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/10/10/3
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/10/10/4
Mailing ListThird Party Advisory
securityfocus.com / bid/92999
Third Party AdvisoryVDB Entry