Because Java 7u80 is no longer maintained, it is susceptible to all vulnerabilities discovered in later versions of Java (Java 8, 11, 17, 21) that share the same legacy codebase.
Notable post-EOL vulnerabilities that likely affect 7u80 include: java 7 update 80 vulnerabilities
Ideally, you would uninstall Java 7 entirely and move to Java 8, 11, or 17. But if you have a legacy application that requires Java 7 Update 80 (or any Java 7 version), implement these compensating controls: Because Java 7u80 is no longer maintained, it
Place the Java 7 host on an isolated VLAN with no internet access. Restrict inbound traffic to specific source IPs. Block all outbound traffic except to the legacy application server. Detection methods:
The most notorious risks associated with Java 7 Update 80 involve the Java browser plug-in (Applets/Web Start). Although modern browsers have deprecated NPAPI support, legacy intranet applications still enable these interfaces.
CVE-2015-4903 allowed remote attackers to execute arbitrary code via a crafted serialized object. Attackers would lure users to a malicious website; the site would invoke the Java 7 runtime, bypass the SecurityManager, and install ransomware or backdoors. Update 80 contains no mitigations for this.
CVE-2016-0603 allowed remote attackers to execute arbitrary code via vectors related to image parsing. Even if your browser claims to "ask for permission," these exploits could trigger without user interaction.
