What’s Vulnerable › Vulnerabilities

CVE-2017-2646

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-07-27 · updated 2026-06-17
• Weakness: CWE-835

Description

It was found that when Keycloak before 2.5.5 receives a Logout request with a Extensions in the middle of the request, the SAMLSloRequestParser.parse() method ends in a infinite loop. An attacker could use this flaw to conduct denial of service attacks.

Affected products

• Keycloak: before 2.5.5 — fixed in 2.5.5

How to fix

Upgrade to a fixed version: Keycloak 2.5.5. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/96882
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2646
• http://www.securityfocus.com/bid/96882
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2646

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