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Weakness

Observable Response Discrepancy

CWE-204 · Base · Incomplete

The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.

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Weakness Relationships

Where this weakness sits in the CWE hierarchy. Walk up to broader classes or down to more specific variants.
Parent of this (broader)
ChildOfCWE-203 · Observable Discrepancy
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Attack Patterns (CAPEC)

4
How adversaries exploit this weakness, per MITRE CAPEC.
CAPEC-331ICMP IP Total Length Field Probe
CAPEC-332ICMP IP 'ID' Field Error Message Probe
CAPEC-541Application Fingerprinting
CAPEC-580System Footprinting
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CVEs With This Weakness

153
A sample of the 153 CVEs tagged with this weakness.
CVECVE-2026-8242
CVECVE-2026-44306
CVECVE-2026-4113
CVECVE-2026-40485
CVECVE-2026-4045
CVECVE-2026-39851
CVECVE-2026-34319
CVECVE-2026-34264
CVECVE-2026-33688
CVECVE-2026-33419
CVECVE-2026-33323
CVECVE-2026-31901
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Nuclei Scanner Templates

5
Open-source Nuclei templates that detect this weakness class - an actionable scan-for-it pivot. Licensed under the ProjectDiscovery / Nuclei terms.
mediumPiwigo - User Enumeration via Password Reset
mediumGhost CMS - User Enumeration
mediumDify User Enumeration via Observable Response Discrepancy
mediumNocoDB - User Enumeration
mediumAnythingLLM - Username Enumeration via Password Recovery
External lookups - second-class, for what we don’t hold ourselves
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