Resource exhaustion in scapy - #VU148426
Published: September 9, 2026
Vulnerability identifier: #VU148426
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the TFTP_RRQ_server read-server automaton when handling a TFTP read request without a matching acknowledgement. A remote attacker can send a TFTP read request for an available file and withhold the matching acknowledgement to cause a denial of service.
The affected server instance handles one transfer at a time and remains occupied while retransmitting the same data block every three seconds.
Affected software
scapy
Remediation
Install security update from vendor's website.
scapy - update to 2.8.0