CVE-2011-0611

Adobe Flash Player contains a flaw tracked as CWE-843 that allows remote attackers to execute arbitrary code or crash the application (denial of service) by inducing it to load specially crafted Flash content. Exploitation requires only that a victim's Flash runtime process a malicious SWF file — for example embedded in a document or served by a website — with no authentication involved; related reporting from this era describes waterhole attacks in which compromised websites served Flash exploits to targeted users. A successful attack yields code execution with the privileges of the user running Flash, which for browser-plugin deployments typically means the logged-in desktop user. Anyone running affected Adobe Flash Player is affected; CISA's listing does not enumerate specific vulnerable versions, and the product line is end-of-life. Exploitation is confirmed: the flaw was added to CISA's KEV catalog on 2022-03-03, EPSS assigns a 99.4% 30-day exploitation probability (100th percentile), and no public proof-of-concept is known.

What to do: Because Flash Player is end-of-life and receives no security updates, remove or uninstall it entirely — including browser plugins, standalone runtimes, and any embedded copies — which is also CISA's required action for impacted systems. If removal must be deferred, disconnect affected systems or block untrusted Flash content and audit logs for exploitation, given the confirmed in-the-wild status and ~99% exploitation probability; whether ransomware operators have used this flaw is unknown.