CVE-2019-13421: Search Guard versions before 23.1 had an issue that an administrative user is able to retrieve bcrypt password

Q: How do I fix CVE-2019-13421?

search guard: upgrade to 23.1. Exact commands for each OS are on this page.

Q: Is CVE-2019-13421 being exploited?

CVE-2019-13421 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-2019-13421 affect?

CVE-2019-13421 affects search guard. Severity is medium (CVSS 4.9). Search Guard versions before 23.1 had an issue that an administrative user is able to retrieve bcrypt password hashes of other users configured in the internal user database.

Q: How urgent is CVE-2019-13421?

Priority 39/100. Public exploit reference

Routine

MEDIUM 4.9UPGRADE

CVE-2019-13421 is a medium-severity flaw (CVSS 4.9) affecting search guard. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Search Guard versions before 23.1 had an issue that an administrative user is able to retrieve bcrypt password hashes of other users configured in the internal user database.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-522, CWE-200
Published	2019-08-23
Last modified	2026-06-17

Publisher (CNA): floragunn GmbH · Vendor: search-guard

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

Am I affected?

Timeline

2019-08-23 14:15 UTCPublished CVE record published
2026-06-17 02:16 UTCUpdated Record last modified

search-guard search guard UPGRADE

Affected: < 23.1

Fixed in: 23.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy search-guard || rpm -q search-guard || search-guard --version

2. UPGRADE to 23.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade search-guard

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade search-guard

Note

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

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-2019-13421?

search guard: upgrade to 23.1. Exact commands for each OS are on this page.

Is CVE-2019-13421 being exploited?

CVE-2019-13421 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-2019-13421 affect?

CVE-2019-13421 affects search guard. Severity is medium (CVSS 4.9). Search Guard versions before 23.1 had an issue that an administrative user is able to retrieve bcrypt password hashes of other users configured in the internal user database.

How urgent is CVE-2019-13421?

Priority 39/100. Public exploit reference

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CVE-2019-13420 MEDIUM 5.9 UPGRADE Search Guard versions before 21.0 had an timing side channel issue when using the internal user database.
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References

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