PT-2021-3006 · Microsoft · Exchange Server

Orange Tsai · CVE-2021-31207 · Published 2021-05-11 · Updated 2026-07-07

Positive Technologies (AI Summary)

CVSS v2.0

7.6

High

Base vector

AV:N/AC:H/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Microsoft Exchange Server (affected versions not specified)

Description A security feature bypass in Microsoft Exchange Server allows a remote attacker to bypass security mechanisms and execute arbitrary code with SYSTEM privileges. This issue involves an arbitrary file write capability that can lead to remote code execution.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Unrestricted File Upload

Weakness Enumeration

CWE-434

CWE-254

Related Identifiers

BDU:2021-02608

CVE-2021-31207

ZDI-21-819

Affected Products

Exchange Server

References · 105

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/exchange_proxyshell_rce.rb · Exploit
• 🔥 http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-31207 · Security Note
• https://bdu.fstec.ru/vul/2021-02608 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-21-819 · Security Note
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31207 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31207 · Security Note
• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31207 · Vendor Advisory
• https://t.me/aptreports/1885 · Telegram Post
• https://t.me/aptreports/1920 · Telegram Post
• https://t.me/aptreports/11574 · Telegram Post
• https://twitter.com/fletch_ai/status/1750309302198268365 · Twitter Post
• https://t.me/cvenotify/87600 · Telegram Post
• https://t.me/aptreports/10874 · Telegram Post