{"version":"https://jsonfeed.org/version/1.1","title":"Patchfirst: CVEs linked to T1048.003 Exfiltration Over Unencrypted Non-C2 Protocol","home_page_url":"https://patchfirst.co/technique/T1048.003/","feed_url":"https://patchfirst.co/feed/technique/T1048.003.json","description":"New and newly exploited CVEs that lead to ATT&CK T1048.003 Exfiltration Over Unencrypted Non-C2 Protocol, with CISA KEV and EPSS context. Newest 50 by publication or KEV listing.","language":"en-GB","items":[{"id":"CVE-2021-34473#kev","url":"https://patchfirst.co/cve/CVE-2021-34473/","title":"[KEV] CVE-2021-34473: Microsoft Exchange Server Remote Code Execution Vulnerability","content_text":"Microsoft · Exchange Server. In CISA KEV since 2021-11-03, known ransomware use. ENISA EUVD lists it as exploited. EPSS >99.9% (higher than 99.99% of CVEs). CVSS 9.1 CRITICAL. Public exploit code exists. ATT&CK: T1190 Exploit Public-Facing Application; T1053.005 Scheduled Task; T1048.003 Exfiltration Over Unencrypted Non-C2 Protocol; T1136 Create Account; T1486 Data Encrypted for Impact. Named in 9 threat reports. Priority 89.4 of 100.","summary":"Microsoft Exchange Server Remote Code Execution Vulnerability","date_published":"2021-11-03T00:00:00.000Z","date_modified":"2026-08-10T19:58:52.000Z","tags":["kev","ransomware","public-exploit","T1190","T1053.005","T1048.003","T1136","T1486"],"_patchfirst":{"reason":"kev","priority":89.4,"kev":{"dateAdded":"2021-11-03","ransomware":true},"epss":{"score":0.99999,"percentile":0.99996},"cvss":{"score":9.1,"severity":"CRITICAL","version":"3.1"},"vendor":"Microsoft","product":"Exchange Server","techniqueIds":["T1190","T1053.005","T1048.003","T1136","T1486"],"reportCount":9,"hasPublicExploit":true,"euvdExploited":true}}]}