CVE-2026-88779
Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
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.
CISA due Oct 7, 2026
- Citrix NetScaler
- High
- CVSS 8.7
- EPSS 0.59%
- Fixed version listed
What to do
Fixed version listed
- Required action
- 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.
- CISA deadline for US federal agencies
- Oct 7, 2026
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| NetScaler ADC | before 14.1-73.41; before 13.1-64.28; before 14.1-73.41 FIPS; before 13.1-37.282 | None listed |
| NetScaler Gateway | before 14.1-73.41; before 13.1-64.28 | 14.1-73.41 |
Advisories and fixes
- Vendor advisory community.citrix.com
Scores and signals
- Exploitation
- Exploited in the wild
- Severity
- High, CVSS 8.7 (v4.0, scored by NetScaler)
- EPSS
- 0.59% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 24, 2026)
- CISA's SSVC decision points
- Exploitation: active. Automatable: yes. Technical impact: partial. As of Oct 4, 2026.
- Weakness
- CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
- Vendor
- Citrix, NetScaler
Timeline
- Added to CISA's Known Exploited Vulnerabilities catalog: exploited in the wild. US federal agencies must remediate by 2026-10-07.