CVE-2026-88773

critical

Description

Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling') 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 and NDcPP; Gateway: before 14.1-73.37 FIPS and before 13.1-64.23.

References

References
More

https://labs.watchtowr.com/here-we-go-again-citrix-netscaler-dtls-preauth-memory-overflow-cve-2026-88772/

https://www.theregister.com/security/2026/09/28/certainties-in-life-death-taxes-and-critical-citrix-vulns-under-attack/5299369

https://www.infosecurity-magazine.com/news/citrix-patches-critical-zero-days/

https://labs.watchtowr.com/oh-look-the-foot-gun-went-off-again-citrix-netscaler-preauth-command-injection-cve-2026-88771/

https://www.cisa.gov/news-events/alerts/2026/09/27/critical-zero-day-vulnerabilities-exploited-citrix-netscaler-adc-gateway

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-87961

Details

Source: Mitre, NVD

Published: 2026-09-27

Updated: 2026-09-29

Risk Information

CVSS v2

Base Score: 9.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

Severity: High

CVSS v3

Base Score: 10

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Severity: Critical

CVSS v4

Base Score: 9.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N

Severity: Critical

EPSS

EPSS: 0.00361