Zero-day vulnerability
Definition
A zero-day vulnerability is a software flaw that attackers exploit before the vendor has released a fix, leaving defenders with no patch available.
Why It Matters
AI tools are lowering the cost of finding such flaws, which raises the pace defenders must keep.
Latest Coverage
- CISA urges immediate patching of exploited Ivanti Connect Secure zero-day 14 October 2026
- CISA expands alert on exploited Citrix NetScaler ADC and Gateway zero-days 13 October 2026
- CISA expands Citrix NetScaler zero-day alert and urges patching of the full CVE set 10 October 2026
- CISA adds actively exploited Citrix NetScaler flaw CVE-2026-88779 to KEV with a three-day deadline 7 October 2026
- CISA adds another actively exploited Citrix NetScaler flaw to KEV with a three-day deadline 6 October 2026
- FortiMail zero-day CVE-2026-104286 under active exploitation; CISA sets a three-day federal deadline 4 October 2026
- CISA warns of two actively exploited critical zero-days in Citrix NetScaler ADC and Gateway 30 September 2026
- Check Point and F5 flaws actively exploited as CISA adds four vulnerabilities to its KEV catalogue 27 September 2026
More in Cybersecurity and AI Threats.
Related Terms
- Known Exploited Vulnerabilities (KEV) catalog
- Ransomware
- CVE
- Prompt injection
- Software supply chain attack
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