Citrix · NetScaler
CVE-2026-88771
A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands
概要
Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.
This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.
CISA: Citrix NetScaler ADC and NetScaler Gateway contain an improper input validation vulnerability that could allow an unauthenticated attacker to execute arbitrary commands.
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30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 Restriction of Operations within the Bounds of a Memory Buffer | NetScaler | 緊急 9.5 | 77% |
| 2026/09/09 | Authentication Bypass Using an Alternate Path or Channel | NetScaler | 緊急 9.3 | 33% |
| 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。