On 21 October, governments, businesses and public organisations around the world began temporarily taking websites and online services offline following warnings about two critical vulnerabilities in PHP, a programming language used by a significant proportion of the world’s websites.
What began as a security issue affecting widely used website technology quickly became an international race to protect vulnerable systems, with millions of attempted attacks being detected as organisations worked to apply urgent security updates.
The incident also highlighted the growing influence of artificial intelligence in cybersecurity and raised important questions about whether businesses are adequately prepared to detect and respond to threats as they emerge.
What happened in the global PHP cybersecurity incident?
PHP is a programming language that helps power websites and online applications used by organisations of all sizes.
Security researchers discovered two critical vulnerabilities that could potentially allow attackers to gain unauthorised control of vulnerable web servers, access sensitive information or disrupt online services.
The researchers had been working with PHP developers to address the weaknesses before making the details public. However, information about the vulnerabilities was leaked before the planned announcement, giving cybercriminals an opportunity to begin targeting potentially affected websites before organisations had completed their security updates.
The consequences were felt around the world.
Government websites and public services were temporarily taken offline in countries including the UK, Germany, France, the Netherlands and Finland. Organisations in Japan and elsewhere also restricted access to online services while they assessed their exposure and applied the necessary fixes.
In the UK, 32 government services were reported to have been taken offline as a precaution, while the National Cyber Security Centre issued 50,000 alerts to potentially affected organisations.
The scale of the attempted attacks was equally concerning
According to cybersecurity company Cloudflare, tens of thousands of attempts to exploit the vulnerabilities were recorded within 45 minutes of the public announcement. This increased to hundreds of thousands within two hours, with millions of attempted exploits recorded by the following day.
Although these figures do not mean millions of websites were successfully compromised, they demonstrate the speed at which attackers can begin targeting newly disclosed vulnerabilities.
As reported in The Guardian’s coverage of the worldwide incident, organisations were racing to secure vulnerable systems while attackers attempted to take advantage of the situation.