CVE-2026-88772
Citrix NetScaler: Improper Restriction of Operations within the Bounds of a Memory Buffer
As of , CVE-2026-88772 in Citrix NetScaler is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch now.
- Exploited
- Yes: CISA listed it on 27 September 2026
- US federal deadline
- 30 September 20263 days after CISA listed it. US federal civilian agencies must fix it by then.
- Used in ransomware campaigns
- Not known to CISA
- Forensic triage
- Required by CISA under BOD 26-04Agencies must also look for signs that attackers already got in.
- EPSS score
- 0.01Higher than 69% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
- Public exploit
- None foundNeither Metasploit nor Exploit-DB lists one.
- Fix
- Vendor advice: community.citrix.com and support.citrix.comLinks below, from CISA's entry.
What CISA says to do
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.
CISA's required action
- community.citrix.comRunning the provided IOCs in the NetScaler console may help identify indicators of exploitation. Customers must conduct forensic triage as…
- support.citrix.com
- support.citrix.com
What the flaw is
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
CISA's 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
The CVE record's description, from NetScaler
- CVE published
- 27 September 2026
- Assigned by
- NetScaler
- CVSS
- 9.5 Critical (CVSS 4.0, from the CNA)
- CWE-119
- Improper Restriction of Operations within the Bounds of a Memory Buffer
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
NetScaler: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2026-19490Authentication Bypass Using an Alternate Path or Channel | Citrix NetScaler | Patch nowForensic triage required by CISA | 0.23 | ||
| CVE-2026-88771Improper Input Validation | Citrix NetScaler | Patch nowForensic triage required by CISA; listed in the last 14 days | 0.01 | ||
| CVE-2026-88779Improper Restriction of Operations within the Bounds of a Memory Buffer | Citrix NetScaler | Patch nowForensic triage required by CISA; listed in the last 14 days | 0.01 | ||
| CVE-2026-3055Out-of-Bounds Read | Citrix NetScaler | Patch this weekMetasploit module | 0.04 | ||
| CVE-2025-7775Memory Overflow | Citrix NetScaler | Patch soon | 0.20 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org