CVEs / CVE-2026-88772
CVE-2026-88772: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
- Known exploited in the CISA KEV catalog since 27 Sep 2026
- high 8.1 CVSS 3.1 (NVD)
- EPSS 78.1% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service
Description
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 Remote Code Execution or Denial of Service
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Citrix NetScaler ADC | before 14.1-73.37 | 14.1-73.37 |
| Citrix NetScaler ADC | before 13.1-64.23 | 13.1-64.23 |
| Citrix NetScaler ADC | before 14.1-73.37 FIPS | 14.1-73.37 FIPS |
| Citrix NetScaler ADC | before 13.1.37.279 FIPS and NDcPP | 13.1.37.279 FIPS and NDcPP |
| Citrix NetScaler Gateway | before 14.1-73.37 | 14.1-73.37 |
| Citrix NetScaler Gateway | before 13.1-64.23 | 13.1-64.23 |
Exploitation
| In CISA KEV since | 27 Sep 2026 |
|---|---|
| Due date for US federal agencies | 30 Sep 2026 |
| Used in ransomware campaigns | Unknown |
| 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. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |
Severity
| CVSS 3.1 | 8.1 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-119 |
References
- CVE-2026-88772 on NVD
- CVE-2026-88772 in the CISA KEV catalog
- https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778 (cited by CISA)
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 (cited by CISA)
- https://support.citrix.com/external/article/CTX694799/steps-to-take-if-netscaler-adc-is-suspec.html (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096&articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778 Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88772 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.