CVE-2023-21529 (GCVE-0-2023-21529)

Vulnerability from cvelistv5 – Published: 2023-02-14 19:33 – Updated: 2026-04-14 03:55
VLAI? CISA KEV
Title
Microsoft Exchange Server Remote Code Execution Vulnerability
Summary
Microsoft Exchange Server Remote Code Execution Vulnerability
Severity ?
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
References
Impacted products
Vendor Product Version
Microsoft Microsoft Exchange Server 2019 Cumulative Update 12 Affected: 15.02.0 , < 15.02.1118.025 (custom)
Create a notification for this product.
Date Public ?
2023-02-14 08:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ba529bfb-ebc6-44c5-b1d5-f100a54f716e

Vulnerability ID: CVE-2023-21529

Status: Confirmed

Status Updated: 2026-04-13 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-04-13
Asserted: 2026-04-13
Scope
Notes: KEV entry: Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability | Affected: Microsoft / Exchange Server | Description: Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-04-27 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529 ; https://nvd.nist.gov/vuln/detail/CVE-2023-21529
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-502
Feed CISA Known Exploited Vulnerabilities Catalog
Product Exchange Server
Due Date 2026-04-27
Date Added 2026-04-13
Vendorproject Microsoft
Vulnerabilityname Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-04-13 18:00 UTC | Updated: 2026-04-13 18:00 UTC
Show details on NVD website
To clipboard 

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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.