CVE-2019-9924: rbash in Bash before 4.4-beta2 did not prevent the shell user from modifying BASH_CMDS, thus allowing the user to execute any command with the permissions of the shell.

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.

⚡ Watch Bash

Get an email when a new Bash advisory drops — max one per day, one-click unsubscribe.

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2019-99240.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

CVE	CSIRTS overview	External
CVE-2019-9924	coverage & exploitation status	NVD · CVE.org