A zero-day is a vulnerability the software vendor doesn't know about yet or hasn't fixed, so there's no patch to close it. The name comes from the zero days of warning your IT team gets: an attacker can exploit it before an official fix exists.
How TecnetOne handles it: TecnetSOC
zero-day vulnerability, zero-day exploit, 0-day
Related terms
Phishing
Phishing is a message, almost always an email, that impersonates a trusted company or person so the victim hands over credentials or opens a malicious file. It's the entry point for most incidents in companies.
Malvertising
Malvertising (malicious advertising) is the use of online ads to spread malware or lead the victim to a fraudulent site. The ads run through legitimate ad networks, so they can appear on news portals or well-known sites without the site knowing.
Social engineering
Social engineering is the set of techniques used to trick a person into handing over information, approving a payment or granting access. It exploits trust, urgency or authority instead of a technical flaw, and phishing is its most common form.
Exploit
An exploit is a program or sequence of instructions that takes advantage of a specific software vulnerability to run code or take control of a system. It's the bridge between a known flaw and a real attack.
Data exfiltration
Data exfiltration is the unauthorized transfer of information from an organization's network to a destination the attacker controls. It's usually the last stage of an intrusion and is disguised as normal traffic (email, cloud, DNS) to go unnoticed; catching it in time is what keeps an intrusion from becoming a breach.
APT (advanced persistent threat)
An APT (advanced persistent threat) is a targeted attack in which a well-resourced group gets into an organization's network and stays hidden for weeks or months to steal information or set up a larger strike. Unlike an opportunistic attack, an APT picks its victim and moves slowly, changing tactics to avoid detection.
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