Summary
Although Update 80 fixed many prior flaws, it was not immune. Critically, several severe vulnerabilities were discovered after Oracle ended public support (April 2015). These were never patched in the Java 7 branch. The most notorious include: java 7 update 80 vulnerabilities
The most critical vulnerabilities affecting Java 7 Update 80 (and the versions immediately preceding it) centered around the Java Sandbox. Java 7 Update 80 — Vulnerabilities: Complete Write-up
Notable post-EOL vulnerabilities that likely affect 7u80 include: it was not immune. Critically