Last Modified: Oct 19, 2025
Affected Product(s):
BIG-IP APM
Known Affected Versions:
15.1.10.2, 15.1.10.3, 15.1.10.4, 15.1.10.5, 15.1.10.6, 15.1.10.7, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2
Fixed In:
17.5.1, 17.1.3, 16.1.6.1, 15.1.10.8
Opened: Jan 22, 2024 Severity: 3-Major
Error "Assigned access token claims cause claim_data to exceed buffer size limit." on APM due to the size limit of a claim >4k bytes included in the JWT access token. In the browser you see an internal server error. In /var/log/ltm you see err tmm[18827]: 01990004:3: /Common/<virtual server>: Request Auth Code from Source ID (null) IP <IP> failed. Error Code (server_error) Error Description (Assigned access token claims cause claim_data to exceed buffer size limit.)
APM OAuth AS cannot provide JWT access tokens and not able to reach resources.
-- OAuth AS configured -- Generate a token with more number of claims that will be included in token. -- User is in multiple AD groups as a memberof that is used as a claim value, which increases the size limit of token.
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