Higress before 2.2.4 panics when processing a Cookie header segment without an equals sign, causing the plugin wrapper to recover and return a continue action that bypasses AI token rate limiting. Unauthenticated attackers can craft a malformed Cookie header to skip rate limit checks and exceed thresholds intended to restrict costly model backend calls.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
higress-group:higress
References 5
https://github.com/higress-group/higress
disclosure@vulncheck.com
https://github.com/higress-group/higress/blob/v2.2.3/plugins/wasm-go/extensions…
disclosure@vulncheck.com
https://github.com/higress-group/higress/blob/v2.2.4/plugins/wasm-go/extensions…
disclosure@vulncheck.com
https://github.com/higress-group/higress/issues/4599
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/higress-before-2.2.4-rate-limit-bypass-via…
disclosure@vulncheck.com