CVE-2023-21707

HIGH

Microsoft Exchange Server - Remote Code Execution via Untrusted Data Deserialization

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2023-21707. PoCs published by N1k0la-T.

AI-analyzed exploit summary This repository contains a proof-of-concept exploit for CVE-2023-21707, a deserialization vulnerability in Microsoft Exchange. The exploit leverages a crafted payload to achieve remote code execution by manipulating serialized objects and using a custom serialization binder to bypass type checks.

Description

Microsoft Exchange Server Remote Code Execution Vulnerability

Exploits (1)

nomisec WORKING POC 28 stars
by N1k0la-T · poc
https://github.com/N1k0la-T/CVE-2023-21707

This repository contains a proof-of-concept exploit for CVE-2023-21707, a deserialization vulnerability in Microsoft Exchange. The exploit leverages a crafted payload to achieve remote code execution by manipulating serialized objects and using a custom serialization binder to bypass type checks.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Exchange Server (specific version not specified, but likely Exchange Server 2019 or earlier)
Auth required
Prerequisites: Access to a vulnerable Exchange server · Valid credentials for authentication · Network access to the target server
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 8.8
EPSS 0.8202
EPSS Percentile 99.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-502
Status published
Products (3)
microsoft/exchange_server 2013 cumulative_update_23
microsoft/exchange_server 2016 cumulative_update_23
microsoft/exchange_server 2019 cumulative_update_11 (2 CPE variants)
Published Feb 14, 2023
Tracked Since Feb 18, 2026