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25,000 IPs Scanned Cisco ASA Devices — New Vulnerability Potentially Incoming

GreyNoise Labs · published 4 September 2025

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Palo Alto Scanning Surges ~500% in 48 Hours, Marking 90-Day High Read at the source ↗
greynoise.io
https://info.greynoise.io/hubfs/Situation-Reports/SITREP-Cisco-Zero-Days.pdf
info.greynoise.io
https://www.greynoise.io/resources/early-warning-signals-attacker-behavior-precedes-new-vulnerabilities?hsCtaAttrib=193264740537
greynoise.io
https://www.cisa.gov/news-events/alerts/2025/09/25/cisa-directs-federal-agencies-identify-and-mitigate-potential-compromise-cisco-devices
cisa.gov
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB
sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW
sec.cloudapps.cisco.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
cisa.gov
https://www.cisa.gov/news-events/directives/ed-25-03-identify-and-mitigate-potential-compromise-cisco-devices
cisa.gov
https://viz.greynoise.io/tags/cisco-asa-scanner?days=90
viz.greynoise.io
https://www.greynoise.io/resources/early-warning-signals-attacker-behavior-precedes-new-vulnerabilities
greynoise.io
https://www.wired.com/story/arcanedoor-cyberspies-hacked-cisco-firewalls-to-access-government-networks
wired.com
https://www.tenable.com/blog/cve-2023-20269-zero-day-vulnerability-in-cisco-asa-and-ftd-reportedly-exploited-ransomware-groups
tenable.com
https://www.rapid7.com/blog/post/2020/07/23/cve-2020-3452-cisco-asa-firepower-read-only-path-traversal-vulnerability-what-you-need-to-know
rapid7.com
https://viz.greynoise.io/tags/cisco-asa-cve-2020-3259-information-disclosure-attempt?days=90
viz.greynoise.io
https://viz.greynoise.io/tags/cisco-asa-information-disclosure-attempt?days=90
viz.greynoise.io
https://viz.greynoise.io/tags/cisco-asa-xss-attempt?days=90
viz.greynoise.io
https://viz.greynoise.io/tags/cisco-asa-arbitrary-file-retrieval-attempt?days=90
viz.greynoise.io
https://www.greynoise.io/products/greynoise-block
greynoise.io