Citrix · NetScaler
CVE-2026-19490
NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490
概要
Vulnerability in NetScaler ADC and NetScaler Gateway.
This issue affects ADC: from 14.1 through 73.32 and from 13.1 through 63.21; Gateway: from 14.1 through 73.32 and from 13.1 through 63.21.
CISA: Citrix NetScaler ADC and NetScaler Gateway contain an authentication-bypass vulnerability involving an alternate path or channel. When the NetScaler appliance is configured as an AAA virtual server or as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy), an unauthenticated remote threat actor may be able to bypass authentication.
対処法
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
米国連邦機関の対応期限：2026年9月12日
Citrixのその他の悪用された脆弱性
| 追加日 | 脆弱性 | 製品 | 深刻度 | 攻撃の可能性 |
|---|---|---|---|---|
| 2026/10/04 | Improper Restriction of Operations within the Bounds of a Memory Buffer | NetScaler | 高 8.7 | 11% |
| 2026/09/27 | Improper Input Validation | NetScaler | 緊急 9.5 | 82% |
| 2026/09/27 | Improper Restriction of Operations within the Bounds of a Memory Buffer | NetScaler | 緊急 9.5 | 77% |
| 2026/03/30 | Out-of-Bounds Read | NetScaler | 緊急 9.3 | 91% |
| 2025/08/26 | Memory Overflow | NetScaler | 緊急 9.2 | 21% |
| 2026/08/26 | Improper Restriction of Operations within the Bounds of a Memory Buffer | NetScaler ADC and NetScaler Gateway | 高 8.8 | 1.0% |
| 2025/08/25 | Improper Privilege Management | Session Recording | 中 5.1 | 3.5% |
| 2025/08/25 | Deserialization of Untrusted Data | Session Recording | 中 5.1 | 18% |
出典：Known Exploited Vulnerabilities（CISA、パブリックドメイン）、CVE records（cve.org）、EPSS（FIRST）。攻撃の可能性は、今後30日以内に誰かがその脆弱性の悪用を試みるというEPSSの推定値です。