CVE-2019-9924

CSIRTS triage

What

rbash in Bash allows shell users to modify BASH_CMDS, enabling execution of arbitrary commands with shell permissions.

Who is affected

Systems using restricted bash (rbash) as a shell for unprivileged users.

Urgency

High priority with CVSS 7.8; defeats restricted shell restrictions and allows privilege escalation.

Action

Update Bash to version 4.4-beta2 or later to prevent BASH_CMDS modification in restricted shells.

AI-assisted analysis generated from the source advisory — verify against the original.

Exploitation outlook

• Low exploitation risk0.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Advisory coverage (1)

• highCVE-2019-9924: rbash in Bash before 4.4-beta2 did not prevent the shell user from modifying BASH_CMDS, thus al…msrc · 2026-08-06

External references

NVD record for CVE-2019-9924

CVE.org record

Embed the live status

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