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CVE Record

CVE-2017-2646: It was found that when Keycloak before 2.5.5 receives a Logout request with a Extensions in the middle of t...

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.

HighCVSS 7.5Not KEV-listedUpdated
Glexia's TakeAutomated analysis

Security readout for executives and security teams

Older Keycloak deployments can be forced into an endless processing loop when handling a malformed SAML logout request. The business impact is service availability: authentication or single sign-on services may become unavailable, disrupting dependent applications. The source bundle does not show active exploitation. Exposure is likely limited to Red Hat Keycloak deployments running versions before 2.5.5, especially where SAML single logout is reachable over the network. The supplied sources do not identify other affected products or configurations. Prioritize remediation for internet-facing or business-critical Keycloak systems because this can disrupt authentication availability. Urgency is high for exposed SSO infrastructure, but the evidence does not support emergency treatment based on known exploitation. Mitigation focus: Inventory Keycloak instances and identify versions older than 2.5.5.; Check Red Hat guidance for the exact fixed version and supported upgrade path.; Prioritize upgrading exposed Keycloak SAML deployments first..

Prepared

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-835: Exact CWE lookup

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cve · low confidence lookup

CVE-2017-2646 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.0HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

7.5High
CVSS 3.0 vector shape for CVE-2017-2646Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red Hatkeycloak2.5.5Listed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-835 · source CWE mapping

Loop with Unreachable Exit Condition ('Infinite Loop')

Loop with Unreachable Exit Condition ('Infinite Loop') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.