Detailed attack pattern
Stable
CAPEC-319: IP (DF) 'Don't Fragment Bit' Echoing Probe
This OS fingerprinting probe tests to determine if the remote host echoes back the IP 'DF' (Don't Fragment) bit in a response packet. An attacker sends a UDP datagram with the DF bit set to a closed port on the remote host to observe whether the 'DF' bit is set in the response packet. Some operating systems will echo the bit in the ICMP error message while others will zero out the bit in the response packet.
Low
Typical severity
Per MITRE
Medium
Likelihood of attack
Per MITRE
1
Related weaknesses
CWEs this targets
Detailed
Abstraction
MITRE classification
Overview
CAPEC-319 (IP (DF) 'Don't Fragment Bit' Echoing Probe) is a detailed-level attack pattern catalogued by MITRE in the Common Attack Pattern Enumeration and Classification (CAPEC). It describes a recurring method attackers use to exploit software weaknesses.