Security readout for executives and security teams
CVE-2016-9401 is a local bash flaw involving popd. A local user may bypass restricted-shell limits and trigger a use-after-free that can crash bash. The main business risk is availability disruption or weakening of shell restrictions on systems that rely on restricted bash. Exposure is most relevant on Unix-like systems with vulnerable bash packages, especially where local shell access exists or restricted bash is used as a control. The source bundle cites Red Hat, Gentoo, and Debian security updates but does not enumerate all affected versions. Handle through standard patch management with moderate priority. Escalate if restricted shell is used for tenant, contractor, jump-host, or automation containment, because this vulnerability weakens that trust boundary and can affect service availability. Mitigation focus: Apply bash security updates from your operating system vendor.; Prioritize systems offering local shell access to users or services.; Do not rely on restricted bash as the only containment boundary..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-416: Exact CWE lookup
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Open ATT&CK lookupCVE-2016-9401 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.53.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.2MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2017:1931CVE reference · vendor-advisory, x_refsource_REDHAT
- GLSA-201701-02CVE reference · vendor-advisory, x_refsource_GENTOO
- [debian-lts-announce] 20190325 [SECURITY] [DLA 1726-1] bash security updateCVE reference · mailing-list, x_refsource_MLIST
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.