2003
The researchers have notified major antivirus vendors of their findings , and some of them ( Malwarebytes , AVG ) have already issued a patch for the vulnerability .
 patch vulnerability: have already issued
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 patch vulnerability: have already issued