How severe is CVE-2019-9891?

CVE-2019-9891 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-9891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9891?

CVE-2019-9891 affects Tldp Advanced Bash-scripting Guide. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9891?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-9891 published?

CVE-2019-9891 was published on 2019-05-31 and last updated on 2026-06-17.

CVE-2019-9891

CVE-2019-9891 is a critical-severity vulnerability in Tldp Advanced Bash-scripting Guide with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Tldp Advanced Bash-scripting Guide
Published: 2019-05-31
Last modified: 2026-06-17

Description

The function getopt_simple as described in Advanced Bash Scripting Guide (ISBN 978-1435752184) allows privilege escalation and execution of commands when used in a shell script called, for example, via sudo.

Frequently asked questions

What is CVE-2019-9891?: The function getopt_simple as described in Advanced Bash Scripting Guide (ISBN 978-1435752184) allows privilege escalation and execution of commands when used in a shell script called, for example, via sudo.
How severe is CVE-2019-9891?: CVE-2019-9891 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-9891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9891?: CVE-2019-9891 affects Tldp Advanced Bash-scripting Guide. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-9891 published?: CVE-2019-9891 was published on 2019-05-31 and last updated on 2026-06-17.

References

https://www.redteam-pentesting.de/advisories/rt-sa-2019-007

Affected products (1)

cpe:2.3:a:tldp:advanced_bash-scripting_guide:*:*:*:*:*:*:*:*

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