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Advisories

Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length

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severity
medium
date
Affecting

  • zebra >= 0, < 4.5.0

  • zebra >= 0, < 8.0.0

CWE
  • CWE-770 Allocation of Resources Without Limits or Throttling
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
dingledropper, mpguerra, oxarbitrage
Description
Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.

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