PatchTheCVECVE-2019-9891: The function getopt_simple as described in Advanced Bash Scripting Guide (ISBN 978-1435752184) allows privileg
CVE-2019-9891 is a critical-severity flaw (CVSS 9.8) affecting advanced bash-scripting guide. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 3.4% (top 11%) |
| CISA exploited list | No |
| Weakness | CWE-94 |
| Published | 2019-05-31 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2019-9891?
advanced bash-scripting guide: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2019-9891 being exploited?
CVE-2019-9891 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-2019-9891 affect?
CVE-2019-9891 affects advanced bash-scripting guide. Severity is critical (CVSS 9.8). 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 urgent is CVE-2019-9891?
Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action