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CVE-2023-6549 is an unauthenticated remote out-of-bounds memory read and denial-of-service vulnerability in Citrix NetScaler ADC and NetScaler Gateway. When an affected appliance is configured as a Gateway or AAA virtual server, unsafe processing of the HTTP Host header in GET requests to the authentication webview endpoint can cause incorrect snprintf length handling. The response length can exceed the destination buffer, returning process memory beyond the intended buffer boundary. The same vendor fix also addresses the originally reported denial-of-service condition.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Citrix NetScaler ADC and NetScaler Gateway buffer-overflow vulnerability listed as historical exploitation context.
A previously mentioned critical NetScaler vulnerability referenced only in related content.
A buffer overflow vulnerability in NetScaler ADC and NetScaler Gateway.
A denial of service vulnerability in Citrix NetScaler ADC and Gateway, exploited as a zero-day.
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.