CVE-2023-20109

CVE-2023-20109 is a significant software vulnerability that was discovered in Cisco's IOS and IOS XE software. This flaw, which resides in the GET VPN feature of the software, has been actively exploited by attackers. The issue is a zero-day vulnerability, meaning it was already being used in attacks before the developers were aware of its existence or had a chance to fix it. In September, Cisco first warned its customers about this vulnerability and urged them to apply patches as soon as possible. Despite this initial warning, the vulnerability continued to be targeted by attackers in the wild. It became evident that the flaw was not only severe but also actively exploited, making it a critical concern for all users of the affected software. Last month, and again last week, Cisco reiterated its warnings to customers about the ongoing exploitation of CVE-2023-20109. Alongside these advisories, Cisco released security updates intended to address the vulnerability. Customers have been strongly advised to apply these patches immediately to protect their systems from potential attacks. As of now, it remains crucial for all users of Cisco's IOS and IOS XE software to ensure they have applied the necessary updates to mitigate the risks posed by CVE-2023-20109.