Citrix · NetScaler
CVE-2026-88779
Memory overflow vulnerability leading to Denial of Service
概要
Vulnerability in NetScaler ADC and NetScaler Gateway.
This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.
CISA: Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.
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10月7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 |
|---|---|---|---|---|
| 2026/09/27 | 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% |
| 2026/09/09 | 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。