Vulnerability
CVE-2026-3055
Citrix NetScaler ADC and Gateway: unauthenticated memory overread
Most severe levelDEFCON 2 · Severe risk
Official data
- CVSS 4.0
- 9.3 · critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L - Weakness
- CWE-125
- EPSS
- 4.04% probability of exploitation in the next 30 days, higher than 90% of CVEs
- CISA KEV catalogue
- Yes, since 30 March 2026
Sources: NVD (CVSS, weakness, publication), FIRST (EPSS), CISA (KEV catalogue).
Data read on 4 November 2026.
Timeline
- 23 March 2026Published on NVD
- 24 March 2026First in the DefenceLevel briefing
- 30 March 2026Added to the CISA KEV catalogue
In DefenceLevel briefings4 days
- 2 April 2026Still ongoingDEFCON 4
- 1 April 2026Still ongoingDEFCON 4
- 31 March 2026New in the last 24 hoursDEFCON 2
- 24 March 2026New in the last 24 hoursDEFCON 4
Last 12 months.
The full analysis is in the briefingThe full analysis is in your archive
Why it matters now, who is affected and what to do: every day at 05:00 UTC, for subscribers.Why it matters, who is affected and what to do, as in the daily briefing.
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