CVE-2017-13021: The ICMPv6 parser in tcpdump before 4.9.2 has a buffer over-read in print-icmp6.c:icmp6_print().

Security readout for executives and security teams

CVE-2017-13021 is a tcpdump parsing flaw. A vulnerable tcpdump version can read past a memory buffer while decoding ICMPv6 traffic. For executives, the risk is highest where packet captures or network traffic from untrusted sources are inspected on security, operations, or incident-response systems. Exposure is likely on systems running tcpdump before 4.9.2, including distributions or appliances that package vulnerable tcpdump builds. Risk increases when analysts process untrusted packet captures or inspect hostile network traffic. Prioritize remediation for security operations, network monitoring, and incident-response systems. This is a critical parser bug in a trusted diagnostic tool, but the provided sources do not establish active exploitation. Mitigation focus: Upgrade tcpdump to 4.9.2 or a vendor-fixed package.; Apply relevant OS vendor advisories from Debian, Gentoo, Apple, or Red Hat.; Restrict use of vulnerable tcpdump on untrusted captures or hostile networks..

Prepared

May 22, 2026, 17:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.