CVE-2026-88779: Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by NetScaler, published 2026-10-04).
Weakness: CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
How it can be exploited
Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and no user interaction. Impact: confidentiality none, integrity none, availability high. CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: partial.
- On CISA KEV since
- 2026-10-04
- US federal deadline
- 2026-10-07
- Ransomware use
- Not known
Public exploit evidence (Exploit Observer)
Also known as: BDU:2026-15858, EUVD-2026-92065, GHSA-56r3-m27m-8p62
Exploit Observer has no public exploit code that names this CVE or one of its aliases.
Research and write-ups (6)
- Research or write-up: https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway
- Research or write-up: https://socprime.com/blog/cve-2026-88779-citrix-netscaler-zero-day-exploited-against-saml-deployments
- Research or write-up: https://techhelp.ca/citrix-netscaler-cve-2026-88779-zero-day/?utm_source=reddit&utm_medium=social&utm_campaign=SocialWarfare
- Research or write-up: https://therealistjuggernaut.com/2026/10/06/cisa-adds-actively-exploited-citrix-netscaler-vulnerability-to-kev-catalog-cve-2026-88779-elevated-for-priority-remediation
- Research or write-up: https://watchtowr.com/intelligence/citrix-netscaler-cve-2026-88779-faq
- Research or write-up: https://watchtowr.com/intelligence/citrix-netscaler-denial-of-service-memory-overflow-cve-2026-88779
Vulnerability databases and vendor advisories (5)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://app.opencve.io/cve/CVE-2026-88779
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-92065
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-56r3-m27m-8p62
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-88779
- Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88779
News (1)
13 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.114
likely to be attacked soon - VEDAS
- 0.536
some exploit evidence - On CISA KEV
- Yes, since 2026-10-04
- Detection rule
- None yet
Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| NetScaler ADC | before 14.1-73.41 before 13.1-64.28 before 14.1-73.41 FIPS before 13.1-37.282 | Not stated |
| NetScaler Gateway | before 14.1-73.41 before 13.1-64.28 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
Exploit Observer also maps it to: citrix netscaler_application_delivery_controller, citrix netscaler_gateway, citrix_systems_inc. netscaler_adc, citrix_systems_inc. netscaler_adc_fips, citrix_systems_inc. netscaler_adc_ndcpp, citrix_systems_inc. netscaler_gateway.
How to fix it
Fixed versions stated in the CVE record: 14.1-73.41, 13.1-64.28, 14.1-73.41 FIPS, 13.1-37.282.
CISA 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.
Vendor guidance:
- https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/ (vendor-advisory)
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
Advisories on this CVE
- Citrix NetScaler “CitrixBleed 3” (CVE-2026-3055 / -4368) and CVE-2026-8451, Mar and Jun 2026 (30 Jun 2026)
References
Vendor advisories and patches
- https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/ (vendor-advisory)
Government sources
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88779 (government-resource)
Other references
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.