CVE-2016-7934 Tcpdump CVE debrief

Who should care

Security teams and administrators running tcpdump on systems that process untrusted network traffic or packet captures should prioritize this issue, especially if they are on tcpdump 4.8.1 or earlier. Distribution maintainers and incident responders should also pay attention because multiple vendor advisories reference the CVE.

Technical summary

The vulnerability is a buffer overflow in the RTCP parser, specifically print-udp.c:rtcp_print(). The NVD record identifies CWE-119 and lists tcpdump versions through 4.8.1 as vulnerable, while the description says the issue exists in tcpdump before 4.9.0. Given the CVSS vector, the flaw is network-reachable, requires no privileges or user interaction, and can have severe confidentiality, integrity, and availability impact.

Defensive priority

Critical

Recommended defensive actions

• Upgrade tcpdump to a fixed release at or above 4.9.0.
• If immediate upgrading is not possible, restrict where tcpdump is used and limit processing of untrusted packet data or capture files.
• Use vendor guidance from Debian, Red Hat, and Gentoo advisories linked in the record to align remediation with your distribution package set.
• Verify deployed tcpdump versions across hosts, appliances, and analysis systems, not just primary servers.
• Track this CVE as a high-priority parser memory-safety issue in vulnerability management and patch verification workflows.

Evidence notes

All claims are limited to the supplied NVD-derived corpus and listed advisories. The core facts come from the CVE description and NVD metadata: a buffer overflow in print-udp.c:rtcp_print(), CWE-119, CVSS 9.8, and vulnerable tcpdump versions through 4.8.1. The referenced Debian, Red Hat, and Gentoo advisories corroborate vendor attention to the issue. No exploit technique, proof-of-concept, or unverified patch detail is included.

Official resources