CVE-2016-9401

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.43% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 35.3% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2017-01-23 21:00Z9 YR AGO

Last updated

2025-08-06 21:12Z1 YR AGO

Reserved

2016-11-17

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 6.2)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.1

Document digest

c5f1ffb00660c636c0ddf8d31b0ae9815bf816724a28241807c48b057dc2a8bb

• rhn.redhat.comRHSA-2017:0725http://rhn.redhat.com/errata/RHSA-2017-0725.htmlvendor-advisoryx_refsource_REDHAT
• access.redhat.comRHSA-2017:1931https://access.redhat.com/errata/RHSA-2017:1931vendor-advisoryx_refsource_REDHAT
• www.openwall.com[oss-security] 20161117 bash - popd controlled freehttp://www.openwall.com/lists/oss-security/2016/11/17/5mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20161117 Re: bash - popd controlled freehttp://www.openwall.com/lists/oss-security/2016/11/17/9mailing-listx_refsource_MLIST
• www.securityfocus.com94398http://www.securityfocus.com/bid/94398vdb-entryx_refsource_BID
• security.gentoo.orgGLSA-201701-02https://security.gentoo.org/glsa/201701-02vendor-advisoryx_refsource_GENTOO
• lists.debian.org[debian-lts-announce] 20190325 [SECURITY] [DLA 1726-1] bash security updatehttps://lists.debian.org/debian-lts-announce/2019/03/msg00028.htmlmailing-listx_refsource_MLIST