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CVE-2026-88772 is a memory-overflow vulnerability in Citrix NetScaler ADC and NetScaler Gateway that permits unauthenticated remote code execution or denial of service when DTLS is enabled. DTLS is enabled by default on Gateway VPN virtual servers unless explicitly disabled. Affected releases include ADC and Gateway 14.1 builds before 14.1-73.37 and 13.1 builds before 13.1-64.23, ADC 14.1-FIPS builds before 14.1-73.37 FIPS, and ADC 13.1-FIPS/NDcPP builds before 13.1-37.279. The vulnerability was exploited as a zero-day before its September 27, 2026 disclosure. The specific vulnerable function and triggering input are not identified.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (9 hidden).
The repository contains a README and one standalone Python exploit. Despite being described as a detection-artifact generator, the script performs active exploitation of CVE-2026-88772: it establishes a UDP DTLS association, obtains the DTLS cookie/primer exchange, then sends 120 crafted records intended to corrupt target memory. It contains hard-coded FreeBSD memory addresses, fake timer/list structures, a setcontext pivot, JOP gadgets, a ROP chain, and assembled amd64 shellcode. The payload is tailored to NetScaler version 14.1-73.30 and can write caller-controlled content to a target file; its default action writes "content" to /tmp/file.txt. The code also contains a /bin/sh permission-changing operation, making it substantially more capable than passive vulnerability detection. It is a standalone Python program using pwntools for packing, assembly, shellcode generation, and logging, rather than a module from a named exploit framework.
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A previously disclosed Citrix vulnerability exploited in a campaign underway since at least early September. Organizations across government, finance, legal, and education in North America and Europe were likely affected. Citrix subsequently patched it in a release addressing eight vulnerabilities; the content does not describe its technical mechanism.
A vulnerability with a CVSS score of 9.5 mentioned as background to the main advisory. Citrix confirmed active exploitation on unpatched systems and urged customers to install relevant updates. Its technical cause and specific affected products are not stated.
A NetScaler vulnerability under confirmed active exploitation. Technical details and exploitation chains are outside the article's scope. Administrators are directed to separate Citrix advisories to apply fixes and investigate possible compromise.
A vulnerability affecting NetScaler ADC and NetScaler Gateway, mentioned as background because it is actively exploited. Its technical details are not provided.
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Cross-references every affected SKU, including bundled OEM variants.
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