Vulnerability
CVE-2026-88771
Citrix NetScaler ADC and Gateway: unauthenticated remote code execution
Most severe levelDEFCON 2 · Severe risk
Official data
- CVSS 3.1
- 9.8 · critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-20
- EPSS
- 82.16% probability of exploitation in the next 30 days, higher than 99% of CVEs
- CISA KEV catalogue
- Yes, since 27 September 2026
Sources: NVD (CVSS, weakness, publication), FIRST (EPSS), CISA (KEV catalogue).
Data read on 4 November 2026.
Timeline
- 27 September 2026Published on NVD
- 27 September 2026Added to the CISA KEV catalogue
- 28 September 2026First in the DefenceLevel briefing
In DefenceLevel briefings15 days
- 25 October 2026Still ongoingDEFCON 3
- 24 October 2026Still ongoingDEFCON 3
- 23 October 2026New in the last 24 hoursDEFCON 2
- 15 October 2026New in the last 24 hoursDEFCON 3
- 14 October 2026Still ongoingDEFCON 3
- 13 October 2026New in the last 24 hoursDEFCON 3
- 10 October 2026New in the last 24 hoursDEFCON 3
- 9 October 2026New in the last 24 hoursDEFCON 4
- 8 October 2026Still ongoingDEFCON 4
- 7 October 2026New in the last 24 hoursDEFCON 4
- 6 October 2026New in the last 24 hoursDEFCON 4
- 1 October 2026Still ongoingDEFCON 3
- 30 September 2026Still ongoingDEFCON 3
- 29 September 2026New in the last 24 hoursDEFCON 2
- 28 September 2026New in the last 24 hoursDEFCON 2
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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