ET WEB_SPECIFIC_APPS Kaseya VSA Authenticated Reflected Cross-site Scripting (CVE-2021-30119) M2

SID: 2069326Rev: 11 views
Sourceet/open
CreatedMay 18, 2026
UpdatedMay 18, 2026
Classificationweb-application-attack
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET WEB_SPECIFIC_APPS Kaseya VSA Authenticated Reflected Cross-site Scripting (CVE-2021-30119) M2"; flow:established,to_server; http.request_line; content:"GET /done.asp?"; fast_pattern; content:"FileName|3d|"; pcre:"/^[^&]*?(?:[\x20\x27\x22\x2f]on[a-z]+\x3d|(?:[^\x2f]s(?:cript[\x3a\x3e\x20\x2b\x2f]|tyle\x3d)|\x3ciframe[\x20\x2f]))/R"; reference:url,csirt.divd.nl/cves/CVE-2021-30119/; reference:cve,2021-30119; classtype:web-application-attack; sid:2069326; rev:1; metadata:affected_product Kaseya_VSA, attack_target Server, tls_state TLSDecrypt, created_at 2026_05_18, cve CVE_2021_30119, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_05_18, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

References

urlcsirt.divd.nl/cves/CVE-2021-30119/
cve2021-30119

Metadata

affected productKaseya_VSA
attack targetServer
tls stateTLSDecrypt
created at2026_05_18
deploymentSSLDecrypt
confidenceHigh
signature severityMajor
tagExploit
updated at2026_05_18
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application

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