CVE-2017-12161: It was found that keycloak before 3.4.2 final would permit misuse of a client-side /etc/hosts entry to spoof a

Q: How do I fix CVE-2017-12161?

keycloak: upgrade to 3.4.2. Exact commands for each OS are on this page.

Q: Is CVE-2017-12161 being exploited?

CVE-2017-12161 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-2017-12161 affect?

CVE-2017-12161 affects keycloak. Severity is high (CVSS 8.8). It was found that keycloak before 3.4.2 final would permit misuse of a client-side /etc/hosts entry to spoof a URL in a password reset request. An attacker could use this flaw to craft a malicious password reset request and gain a valid res

This month

HIGH 8.8UPGRADE

CVE-2017-12161 is a high-severity flaw (CVSS 8.8) affecting keycloak. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

It was found that keycloak before 3.4.2 final would permit misuse of a client-side /etc/hosts entry to spoof a URL in a password reset request. An attacker could use this flaw to craft a malicious password reset request and gain a valid reset token, leading to information disclosure or further attacks.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-602, CWE-640
Published	2018-02-21
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: keycloak

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

Am I affected?

Timeline

2018-02-21 18:29 UTCPublished CVE record published
2026-06-17 01:02 UTCUpdated Record last modified

keycloak keycloak UPGRADE

Affected: < 3.4.2

Fixed in: 3.4.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.4.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade keycloak

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-2017-12161?

keycloak: upgrade to 3.4.2. Exact commands for each OS are on this page.

Is CVE-2017-12161 being exploited?

CVE-2017-12161 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-2017-12161 affect?

CVE-2017-12161 affects keycloak. Severity is high (CVSS 8.8). It was found that keycloak before 3.4.2 final would permit misuse of a client-side /etc/hosts entry to spoof a URL in a password reset request. An attacker could use this flaw to craft a malicious password reset request and gain a valid res

How urgent is CVE-2017-12161?

Priority 48/100. High severity

Software pages

Keycloak vulnerabilities

Related CVEs

CVE-2023-6927 MEDIUM 4.6 MITIGATE DOWNGRADE A flaw was found in Keycloak
CVE-2023-6563 HIGH 7.7 UPGRADE DOWNGRADE An unconstrained memory consumption vulnerability was discovered in Keycloak
CVE-2023-6291 HIGH 7.1 UPGRADE DOWNGRADE A flaw was found in the redirect_uri validation logic in Keycloak
CVE-2023-6134 MEDIUM 4.6 UPGRADE UPGRADE A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is app
CVE-2025-8419 MEDIUM 5.3 MITIGATE A vulnerability was found in Keycloak-services

References

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