Heap overflow and improper input validation in Envoy</td></tr><tr><td style=white-space:nowrap><a href=/v1.25/news/security/istio-security-2019-006/>ISTIO-SECURITY-2019-006</a></td><td>November 7, 2019</td><td>1.3 to 1.3.4<br></td><td class=score><a href="https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV%3aN%2fAC%3aL%2fPR%3aN%2fUI%3aN%2fS%3aU%2fC%3aN%2fI%3aN%2fA%3aH%2fE%3aH%2fRL%3aO%2fRC%3aC&version=3.1">7.5</a></td><td>Denial of service</td></tr><tr><td style=white-space:nowrap><a href=/v1.25/