It was found that in icedtea-web up to and including 1.7.2 and 1.8.2 executable code could be injected in a JAR file without compromising the signature verification. An attacker could use this flaw to inject code in a trusted JAR. The code would be executed inside the sandbox.
Exploitability
AV:NAC:HPR:NUI:NScope
S:UImpact
C:HI:HA:H8.1/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HOther