# CVE-2026-88777: Citrix NetScaler ADC and Gateway memory overflow

Source: https://junglewise.ai/threats/cve-2026-88777-memory-overflow-vulnerability-vulnerability-in-citrix-netscaler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-27. Updated: 2026-09-27  
License: CC BY 4.0 with a link back

CVE-2026-88777 · Severity: info · Published 2026-09-27

Citrix NetScaler ADC and Gateway are load balancing and application delivery appliances used to optimize and secure network traffic to critical applications. A memory overflow vulnerability in these products could allow an attacker to trigger unpredictable behavior or denial of service, potentially disrupting access to protected applications and services.

Technologies: [Citrix NetScaler ADC](https://junglewise.ai/threats/technologies/netscaler-adc), [Citrix NetScaler Gateway](https://junglewise.ai/threats/technologies/gateway). Vendors: [Citrix](https://junglewise.ai/threats/vendors/citrix).

## Quick answers

**Is CVE-2026-88777 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88777 being exploited in the wild.

**How severe is CVE-2026-88777?** Informational severity, published 27 September 2026.

**Which products and versions are affected?** Citrix NetScaler ADC before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, before 13.1.37.279 FIPS and NDcPP; Citrix NetScaler Gateway before 14.1-73.37, before 13.1-64.23.

**Is there a fix for CVE-2026-88777?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-88777 attacked?** It is in a network appliance.

**Am I affected by CVE-2026-88777?** Check whether you run Citrix NetScaler ADC or Citrix NetScaler Gateway at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A memory overflow vulnerability exists in Citrix NetScaler ADC and NetScaler Gateway that can result in unpredictable or erroneous behavior or denial of service. The vulnerability affects multiple product versions across ADC and Gateway product lines. Patched versions are available and should be deployed to mitigate the issue.

## Affected products

- Citrix NetScaler ADC before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, before 13.1.37.279 FIPS and NDcPP
- Citrix NetScaler Gateway before 14.1-73.37, before 13.1-64.23

## Timeline

- 2026-09-27: disclosed

## References

- [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](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)

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