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CVE-2026-88778 is a predictable TCP Initial Sequence Number (ISN) vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. When Enhanced ISN Generation is disabled for relevant TCP configurations, the appliance may generate TCP ISNs that can be predicted from previously observed values. Affected releases are ADC versions before 14.1-73.37 or 13.1-64.23, ADC FIPS versions before 14.1-73.37 FIPS, ADC FIPS and NDcPP versions before 13.1-37.279, and Gateway versions before 14.1-73.37 or 13.1-64.23.
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No public exploit code observed for this vulnerability.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A predictable-value vulnerability (CWE-342) affecting Citrix NetScaler ADC and Citrix NetScaler Gateway. The supplied CVSS v4 vector indicates network-reachable exploitation with no privileges or user interaction required and high impacts to vulnerable-system integrity and availability.
A high-severity weakness permitting TCP initial sequence-number prediction, potentially enabling connection prediction, manipulation, or related network attacks when Enhanced ISN Generation is disabled.
A CVSS 8.8 predictable-value vulnerability (CWE-342) affecting Citrix NetScaler ADC and Gateway. The advisory specifies a TCP configuration change as a mitigation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.