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CVE-2025-20343 is a high-severity denial-of-service vulnerability in Cisco Identity Services Engine (ISE). The flaw is caused by a logic error in the RADIUS suppression feature associated with the setting that rejects RADIUS requests from clients with repeated failures. When Cisco ISE processes a specific sequence of crafted RADIUS access requests for a MAC address that is already in a rejected state, the affected node can enter an invalid state and restart unexpectedly. The issue affects Cisco ISE 3.4.0 and 3.4 Patch 1 through Patch 3 when the vulnerable feature is enabled.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
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12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Cisco Identity Services Engine (ISE) logic error in handling certain RADIUS access requests that can be exploited remotely without authentication to trigger an unexpected restart (DoS).
A denial-of-service vulnerability in Cisco Identity Services Engine (ISE) caused by a logic error in the RADIUS suppression feature, allowing unauthenticated remote attackers to trigger system restarts via crafted RADIUS requests when the suppression setting is enabled.
High-severity unauthenticated remote denial-of-service in Cisco Identity Services Engine (ISE) due to a logic error in RADIUS request processing that can trigger unexpected restarts.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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