Glossary
Zero-day vulnerability
Also called Zero-day.
Definition
A zero-day is a software vulnerability that attackers know about or are exploiting before the vendor has released a fix.
Why it matters when you’re buying
With no patch available, defence depends on mitigations, detection and limiting exposure. How quickly and openly a vendor responds to zero-days in its own products is worth asking about during evaluation.
How it relates to other terms
An SBOM tells you whether you run the affected component, and XDR is how you spot exploitation before a patch arrives.
Where to go next
- Security: news, companies and community questions
- How to evaluate Security vendors: criteria, questions to ask and red flags
- Vulnerabilities and patching: the latest stories and threads on this topic
Written by Techarda editors · Updated . Think a definition is wrong or missing something? Email engage@techarda.com. All terms.