Division by zero in nfdump - #VU142742
Published: August 15, 2026
Vulnerability identifier: #VU142742
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-369
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 divide by zero in the nfcapd IPFIX options template handlers when processing crafted IPFIX options templates and subsequent data sets. A remote attacker can send two specially crafted UDP datagrams to cause a denial of service.
The issue is triggered when cumulative attacker-controlled field lengths wrap a 16-bit record offset to zero before division, and the same root cause is reachable through both the NBAR option-data handler and the interface-name option-data handler.
Affected software
nfdump
Remediation
Install security update from vendor's website.
nfdump - update to 1.7.9