CVE-2019-9924: rbash in Bash before 4.4-beta2 did not prevent the shell user from modifying BASH_CMDS, thus allowing the user

Q: How do I fix CVE-2019-9924?

bash: upgrade to 4.4; debian linux: mitigate or apply the listed mitigation; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2019-9924 being exploited?

CVE-2019-9924 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-9924 affect?

CVE-2019-9924 affects bash, debian linux, leap. Severity is high (CVSS 7.8). 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.

Q: How urgent is CVE-2019-9924?

Priority 41/100. High severity; On your watchlist

This month

HIGH 7.8WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2019-9924 is a high-severity flaw (CVSS 7.8) affecting bash, debian linux, leap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-862
Published	2019-03-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: canonical · debian · gnu · netapp · opensuse

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-03-22 08:29 UTCPublished CVE record published
2026-06-17 02:44 UTCUpdated Record last modified

gnu bash UPGRADE

Affected: < 4.4 · 4.4 beta1

Fixed in: 4.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bash || rpm -q bash || bash --version

2. UPGRADE to 4.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bash

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bash

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

opensuse leap MITIGATE

Affected: 42.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 42.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp hci management node MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hci-management-node || rpm -q hci-management-node || hci-management-node --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

netapp solidfire MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy solidfire || rpm -q solidfire || solidfire --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

canonical ubuntu linux MITIGATE

Affected: 12.04 · 14.04 · 16.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-9924?

bash: upgrade to 4.4; debian linux: mitigate or apply the listed mitigation; leap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-9924 being exploited?

CVE-2019-9924 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-9924 affect?

CVE-2019-9924 affects bash, debian linux, leap. Severity is high (CVSS 7.8). 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.

How urgent is CVE-2019-9924?

Priority 41/100. High severity; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities

Related CVEs

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CVE-2017-5932 HIGH 7.8 MITIGATE The path autocompletion feature in Bash 4.4 allows local users to gain privileges via a crafted filename start
CVE-2016-9401 MEDIUM 5.5 UPGRADE MITIGATE popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted a
CVE-2016-7543 HIGH 8.4 UPGRADE MITIGATE Bash before 4.4 allows local users to execute arbitrary commands with root privileges via crafted SHELLOPTS an

References

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