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Bidda Sovereign Intelligence · 10,065 Verified Nodes · 39 Sovereign Pillars

MITRE CAPEC-326: TCP Initial Window Size Probe (Detailed Attack Pattern - Low Severity)

MITRE CAPEC-326 (TCP Initial Window Size Probe) is a detailed-level attack pattern in the MITRE Common Attack Pattern Enumeration and Classification. This…

Compliance Node Overview

MITRE CAPEC-326 (TCP Initial Window Size Probe) is a detailed-level attack pattern in the MITRE Common Attack Pattern Enumeration and Classification. This OS fingerprinting probe checks the initial TCP Window size. TCP stacks limit the range of sequence numbers allowable within a session to maintain the "connected" state within TCP protocol logic. The initial window size specifies a range of acceptable sequence numbers that will qualify as a response to an ACK packet within a session. Various operating systems use different Initial window sizes. Likelihood of attack: Medium. Typical severity: Low. Maps to weaknesses CWE-200.

Pillar: Cybersecurity · Authority: MITRE Corporation · Version: 1.0.0 · Last updated: 2026-05-25

Primary source: https://capec.mitre.org/data/definitions/326.html

SHA-256 integrity: 6830b39f2b0c81f1de45db9e629612a5c4ab14f16442c91e715f1ba2bcade09a

Primary Citations — 7 traced to source

MITRE CAPEC-326: TCP Initial Window Size Probe (https://capec.mitre.org/data/definitions/326.html)
CWE-200: underlying weakness (http://cwe.mitre.org/data/definitions/200.html)

+ 5 more citations (full bibliography, deterministic workflow, actionable schema and crosswalks) included in the vault unlock — $0.01 via Skyfire / L402 / Direct Base USDC.

Access

Discovery (free): /api/v1/nodes/mitre-capec-capec-326-tcp-initial-window-size-probe.json — 6-field metadata
Vault (full node): /api/v1/vault/nodes/mitre-capec-capec-326-tcp-initial-window-size-probe.json — full 13-key payload, $0.01 USDC (L402/Skyfire/Direct Base)
Canonical URL: https://bidda.com/intelligence/mitre-capec-capec-326-tcp-initial-window-size-probe
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