PF in OpenBSD 3.0 with the return-rst rule sets the TTL to 128 in the RST packet, which allows remote attackers to determine if a port is being filtered because the TTL is different than the default TTL.

Threat-Mapped Scoring

Score: 0.0

Priority: Unclassified

EPSS

Score: 0.01546
Percentile: 0.80584

CVSS Scoring

Mapped CWE(s)

• CWE-203 : Observable Discrepancy

All CAPEC(s)

CAPEC(s) with Mapped TTPs

Mapped ATT&CK TTPs

Affected Products

• cpe:2.3:o:openbsd:openbsd:3.0:*:*:*:*:*:*:*

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