{"id":"CVE-2026-3055","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-3055","generatedAt":"2026-10-28T02:18:29.646Z","title":"Citrix NetScaler Out-of-Bounds Read Vulnerability","description":"Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread","published":"2026-03-23T21:17:17.000Z","lastModified":"2026-06-17T10:42:58.000Z","status":"Analyzed","sourceIdentifier":"50a63c94-1ea7-4568-8c11-eb79e7c5a2b5","cvss":{"version":"4.0","score":9.3,"severity":"CRITICAL","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-125"],"affected":["citrix/netscaler application delivery controller","citrix/netscaler gateway"],"epss":{"score":0.91491,"percentile":0.99811,"date":"2026-10-26","history":[{"date":"2026-09-24","score":0.04042,"percentile":0.90234},{"date":"2026-10-25","score":0.91491,"percentile":0.99811}]},"kev":{"listed":true,"dateAdded":"2026-03-30","dueDate":"2026-04-02","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.\nhttps://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300&articleURL=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_3055_and_CVE_2026_4368 ; https://nvd.nist.gov/vuln/detail/CVE-2026-3055"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 2 April 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.91491,"from":0.04042,"percentile":0.99811},"summary":"EPSS moved from 4.0% to 91.5% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-09-24T00:00:00.000Z","detail":{"to":0.04042,"from":0.87166,"percentile":0.90234},"summary":"EPSS moved from 87.2% to 4.0% probability of exploitation in the next thirty days."}],"references":[{"url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300","tags":["Vendor Advisory"],"source":"50a63c94-1ea7-4568-8c11-eb79e7c5a2b5"},{"url":"https://labs.watchtowr.com/please-we-beg-just-one-weekend-free-of-appliances-citrix-netscaler-cve-2026-3055-memory-overread-part-2/","tags":["Exploit","Third Party Advisory"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-3055","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}