- Description
- Microsoft Exchange Server Remote Code Execution Vulnerability
- Source
- secure@microsoft.com
- NVD status
- Analyzed
- Products
- exchange_server
CVSS 3.1
- Type
- Secondary
- Base score
- 8.8
- Impact score
- 5.9
- Exploitability score
- 2.8
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Severity
- HIGH
Data from CISA
- Vulnerability name
- Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
- Exploit added on
- Apr 13, 2026
- Exploit action due
- Apr 27, 2026
- 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.
- secure@microsoft.com
- CWE-502
- Hype score
- Not currently trending
CISA added CVE-2023-21529 to KEV: authenticated deserialization → RCE on on-prem Exchange, and ransomware crews are using it. Microsoft patched in Feb 2023. If your Exchange box hasn't taken that update, this week. https://t.co/4yuOpRwcmN
@TechTranslators
25 Apr 2026
2 Impressions
0 Retweets
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米国サイバーセキュリティ・社会基盤安全保障庁(CISA)の既知の悪用された脆弱性カタログが更新。4件についてランサムウェアによる悪用を確認。対象はPaperCut NG/MFのCVE-2023-27351、TeamCityのCVE-2024-27199、Exchange Sevr
@__kokumoto
21 Apr 2026
1024 Impressions
0 Retweets
2 Likes
1 Bookmark
1 Reply
1 Quote
🛡️ Microsoft Exchange Deserialization RCE Explained CVE-2023-21529 is a critical vulnerability in Microsoft Exchange Server. It involves the deserialization of untrusted data, allowing an authenticated attacker to achieve remote code execution. This is a classic example of
@xhackio
14 Apr 2026
25 Impressions
0 Retweets
0 Likes
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🛡️ CVE-2023-21529: Vulnerabilidad Crítica de Deserialización en Microsoft Exchange Server Análisis técnico de CVE-2023-21529, una vulnerabilidad de deserialización en Microsoft Exchange Server que permite ejecución remota de código. Impacto, mitigaci https://t.co/LOXH
@CiberPlanetaOrg
14 Apr 2026
26 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
🛡️ Alerta de Seguridad: Vulnerabilidad de Deserialización de Datos No Confiables en Microsoft Exchange Server (CVE-2023-21529) Microsoft Exchange Server sufre una vulnerabilidad de deserialización de datos no confiables (CWE-502) que permite ejecución remota de código (R
@CiberPlanetaOrg
14 Apr 2026
29 Impressions
0 Retweets
0 Likes
0 Bookmarks
0 Replies
0 Quotes
TRC analysis shows attackers chaining Microsoft Exchange Server deserialization exploits (CVE-2023-21529) with Windows privilege escalation vulnerabilities for lateral movement campaigns. Runtime segmentation helps contain post-compromise activity across cloud workloads.
@aviatrixtrc
14 Apr 2026
35 Impressions
0 Retweets
0 Likes
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0 Replies
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CISAが既知の悪用された脆弱性7件をカタログに追加 CISA Adds Seven Known Exploited Vulnerabilities to Catalog #CISA (Apr 13) CVE-2012-1854 Microsoft Visual Basic for Applications のライブラリ読み込みの脆弱性 CVE-2020-9715 Adobe AcrobatのUse-Af
@foxbook
13 Apr 2026
285 Impressions
0 Retweets
3 Likes
0 Bookmarks
0 Replies
0 Quotes
Latest Known Exploited Vulnerabilities (#KEV) : #CVE-2023-21529 #Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability https://t.co/FOaSS8P5RM
@ScyScan
13 Apr 2026
37 Impressions
0 Retweets
0 Likes
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[
{
"nodes": [
{
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