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greynoise.io · medium

GreyNoise Reports 597,000-Session Spike in SonicWall SonicOS API Scanning, Echoing Pattern Before CVE-2026-0400

Between May 9 and May 18, 2026, GreyNoise observed a major spike in scanning of SonicWall SonicOS management interfaces. The May 12 peak of about 597,000 sessions was the largest single-day total on the SonicWall SonicOS API Scanner tag in 90 days, roughly 46x the typical daily volume. Earlier spikes on this tag (January 18, January 30 an…

CVE-2026-0400
greynoise.io · medium

GreyNoise: Scanning surges against network edge vendors precede CVE disclosure by a median of 11 days

GreyNoise analyzed 147.8 million sessions over 103 days across 276 vendor-specific tags covering 18 network infrastructure vendors. It found that surges in scanning and exploitation activity regularly precede vendor advisories. Of 104 detected surges, 68 preceded a vendor-matched CVE (33 vulnerabilities across 16 vendor families), with a …

CVE-2026-20127 CVE-2026-0400 CVE-2026-24858 technology telecommunications