Detections
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CVE-2026-88771

critical

Description

Improper input validation 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 an unauthenticated attacker to execute arbitrary commands.

References

https://www.securityweek.com/citrix-urges-immediate-patching-of-critical-netscaler-vulnerability/

https://www.databreachtoday.com/citrix-ships-another-emergency-fix-for-netscaler-appliances-a-33054

https://www.bleepingcomputer.com/news/security/citrix-warns-admins-to-patch-new-netscaler-rce-flaw-immediately/

https://thehackernews.com/2026/10/citrix-patches-critical-netscaler-flaw.html

https://securityaffairs.com/200670/security/cve-2026-107406-citrix-fixes-critical-netscaler-adc-and-gateway-vulnerability.html

https://www.theregister.com/security/2026/10/05/citrix-netscaler-security-snafus-get-even-worse-amid-more-0-day-reports/5301232

https://www.helpnetsecurity.com/2026/10/05/cisa-flags-new-exploited-netscaler-flaw-as-attackers-crash-appliances-cve-2026-88779/

https://www.databreachtoday.com/citrix-patches-yet-another-under-fire-zero-day-in-netscaler-a-33017

https://therecord.media/us-australia-warn-of-latest-citrix-vulnerability

https://thehackernews.com/2026/10/new-netscaler-zero-day-exploited-in.html

https://cyberscoop.com/citrix-netscaler-third-exploited-zero-day-vulnerability/

https://www.securityweek.com/exploitation-of-citrix-netscaler-zero-day-hits-appliances-patched-days-earlier/

https://thehackernews.com/2026/10/critical-fortimail-zero-day-flaw.html

https://thehackernews.com/2026/10/citrix-netscaler-post-exploitation.html

https://databreaches.net/2026/10/01/suspected-state-hackers-exploited-citrix-netscaler-for-weeks-50000-devices-may-still-be-exposed/

https://www.securityweek.com/government-finance-orgs-targeted-in-weeks-long-netscaler-zero-day-attacks/

https://www.levelblue.com/blogs/spiderlabs-blog/citrix-netscaler-cve-2026-88771-observed-exploitation-artifacts-and-hunt-indicators

https://www.helpnetsecurity.com/2026/09/30/cve-2026-88772-netscaler-exploitation-zero-day/

https://thehackernews.com/2026/09/citrix-netscaler-cve-2026-88772-exploit.html

https://thehackernews.com/2026/09/attackers-exploit-netscaler-flaw-for.html

https://www.theregister.com/security/2026/09/29/custom-malware-used-in-citrix-0-day-attacks-targeting-govt-banks-professional-services/5299867

https://www.hipaajournal.com/citrix-zero-day-vulnerabilities-exploited-sept-2026/

https://www.bleepingcomputer.com/news/security/hackers-exploit-citrix-netscaler-zero-day-to-deploy-web-shells/

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

https://cyberscoop.com/citrix-netscaler-zero-day-attacks-three-weeks-undetected/

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

https://www.sophos.com/en-us/blog/citrix-netscaler-cve-2026-88771-cve-2026-88772-in-active-exploitation

https://www.securityweek.com/citrix-confirms-2-netscaler-zero-days-after-admins-pulled-the-plug/

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

https://www.helpnetsecurity.com/2026/09/28/citrix-netscaler-rce-zero-days-exploited-for-weeks-cve-2026-88771-cve-2026-88772/

https://www.databreachtoday.com/hackers-hit-netscaler-zero-days-before-citrix-patched-a-32959

https://www.darkreading.com/vulnerabilities-threats/netscaler-zero-days-chaos-citrix

https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-exploited-citrix-flaws-by-wednesday/

https://therecord.media/us-uk-warn-of-citrix-netscaler-zero-day-bug

https://thehackernews.com/2026/09/cisa-says-attackers-are-exploiting-two.html

https://securityaffairs.com/199891/hacking/u-s-cisa-adds-citrix-netscaler-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://cyberscoop.com/citrix-zero-days-delayed-disclosure/

https://cloud.google.com/blog/topics/threat-intelligence/defending-against-active-exploitation-of-citrix-netscaler-adc-and-gateway-appliances/

https://www.greynoise.io/blog/swarming-against-citrix-0-day-exploitation

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

https://thehackernews.com/2026/09/warning-two-unpatched-citrix-netscaler.html

https://securityaffairs.com/199873/security/citrix-confirmed-two-new-netscaler-flaws-exploited-as-zero-day.html

https://www.cisa.gov/news-events/alerts/2026/09/27/cisa-adds-two-known-exploited-vulnerabilities-catalog

https://www.bleepingcomputer.com/news/security/citrix-admins-warned-to-shut-down-netscalers-over-2-exploited-zero-days/

https://github.com/SwiftSecur/CVE-2026-88771-HuntScript

https://github.com/EXEcution-py/CVE-2026-88771-POC

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771

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

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-87958

Details

Source: Mitre, NVD

Published: 2026-09-27

Updated: 2026-09-29

Named Vulnerability: PitScalerKnown Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

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

Severity: Critical

CVSS v3

Base Score: 9.8

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

Severity: Critical

CVSS v4

Base Score: 9.5

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

Severity: Critical

EPSS

EPSS: 0.01083

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest