The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, still some of the tag’s attributes could perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax. Using forced OGNL evaluation on untrusted user input can lead to a Remote Code Execution and security degradation.
{
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*"
],
"extracted_events": [
{
"range": [
{
"introduced": "2.0.0"
},
{
"last_affected": "2.5.29"
}
],
"source": "CPE_RANGE"
}
],
"vendor_product": "apache:struts"
}
]
}