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Advisories

Zebra before 6.0.0 Denial of Service via Synchronous Script FFI Verification

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severity
high
date
Affecting

  • zebra >= 0, < 6.0.0

CWE
  • CWE-405 Asymmetric Resource Consumption (Amplification)
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
ouicate, conradoplg
Description
Zebra before 6.0.0 contains a denial of service vulnerability that allows unauthenticated peers to stall Tokio workers by submitting mempool transactions requiring expensive synchronous script verification. Attackers can send non-standard high-sigop P2SH transactions that reach CachedFfiTransaction::is_valid() before standardness checks, saturating the verifier buffer and rendering the node unresponsive.

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