{"history": [{"role": "system", "content": "You are a cyber security AI agent expanding its knowledge base by analyzing live web intelligence."}], "response": "Information acquired from en.wikipedia.org: [ 26 ] Cybercriminals can reverse engineer the patch to find the underlying vulnerability and develop exploits, [ 27 ] often faster than users install the patch. [ 26 ] According to research by RAND Corporation published in 2017, zero-day exploits remain usable for 6.9 years on average, [ 28 ] although those purchased from a third party only remain usable for 1.4 years on average. [ 19 ] The researchers were unable to determine if any particular platform or software (such as open-source software ) had any relationship to the life expectancy of a zero-day vulnerability. [ 29 ] Although the RAND researchers found that 5.7 percent of a stockpile of secret zero-day vulnerabilities will have been discovered by someone else within a year, [ 30 ] another study found a higher overlap rate, as high as 10.8 percent to 21.9 percent per year. [ 31 ] Because, by definition, there is no patch that can block a zero-day exploit, all systems employing the software or hardware with the vulnerability are at risk. This includes secure systems such as banks and governments that have all patches up to date. [ 32 ] Security systems are designed around known vulnerabilities, and repeated exploitations of a zero-day exploit could continue undetected for an extended period of time. [ 23 ] Although there have been many proposals for a system that is effective at detecting zero-day exploits, this remains an active area of research in 2023.", "source": "https://en.wikipedia.org/wiki/Zero-day_vulnerability"}