CVE-2023-28310: Microsoft Exchange Server Remote Code Execution Vulnerability

Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

Microsoft Exchange Server Remote Code Execution Vulnerability

What

Microsoft Exchange Server Remote Code Execution Vulnerability

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through an adjacent network may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

What

Microsoft Exchange Server Remote Code Execution Vulnerability

Why

Attacker-influenced serialised data is reconstructed as trusted objects, which can invoke dangerous application behaviour.

How

An attacker operating through an adjacent network may attempt exploitation with low privileges. If successful, the issue may execute code or commands in the affected security context.

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: an adjacent network → Deserialization of Untrusted Data → execute code or commands in the affected security context
Attack surface: Adjacent
Privileges required: Low: a basic authenticated account is required
User interaction: None
Attack complexity: Low: no specialised conditions are recorded
Security boundary: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-502 ↗
CWE-502: Deserialization of Untrusted Data. The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVAdjacentAttack vector: The attacker must be on an adjacent or logically close network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land: After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.

Remote code executionCWE-502

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2023-32017Official EUVD mapping

0 linked advisory records.

Official EUVD record ↗

BSI · German · WID-SEC-2023-1445Microsoft Exchange Server: Mehrere Schwachstellen ermöglichen Codeausführung

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Microsoft Exchange Server ausnutzen, um beliebigen Programmcode auszuführen.

Official advisory ↗

Cyber Security Agency of Singapore · English · CSA-SB-20230621Security Bulletin 21 Jun 2023

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 21 Jun 2023, published on 21 June 2023. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗

CERT-FR · French · CERTFR-2023-AVI-0465Multiples vulnérabilités dans les produits Microsoft

023-25652 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-25652 Bulletin de sécurité Microsoft CVE-2023-25815 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-25815 Bulletin de sécurité Microsoft CVE-2023-27909 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-27909 Bulletin de sécurité Microsoft CVE-2023-27910 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-27910 Bulletin de sécurité Microsoft CVE-2023-27911 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-27911 Bulletin de sécurité Microsoft CVE-2023-28310 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-28310 Bulletin de sécurité Microsoft CVE-2023-29007 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29007 Bulletin de sécurité Microsoft CVE-2023-29011 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29011 Bulletin de sécurité Microsoft CVE-2023-29012 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29012 Bulletin de sécurité Microsoft CVE-2023-29331 du 13 juin 2023 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29331 Bulletin de sécurité Microsoft CVE-2023-

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2023-002204Microsoft Exchange Server におけるリモートでコードを実行される脆弱性

Microsoft Exchange Server には、リモートでコードを実行される脆弱性が存在します。

Official advisory ↗

KISA KrCERT/CC · Korean · KNVD-5951MS 7월 보안 위협에 따른 정기 보안 업데이트 권고

Official advisory ↗

KISA KrCERT/CC · Korean · KNVD-5936MS 6월 보안 위협에 따른 정기 보안 업데이트 권고

Official advisory ↗

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: Microsoft Exchange Server 2016 Cumulative Update 23: 15.01.0 < 15.01.2507.027
Microsoft Exchange Server 2019 Cumulative Update 12: 15.02.0 < 15.02.1118.030
Microsoft Exchange Server 2019 Cumulative Update 13: 15.02.0 < 15.02.1258.016
Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.

Evidence and provenance

Published 14 Jun 2023 · Last source change 28 Feb 2025, 21:09 UTC · CWE-502 · Deserialization of Untrusted Data

CVE recordCVE.org · 5.1

CVSS sourceCNA

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-08-14

European sourceENISA EUVD · EUVD-2023-32017

Product sourceCNA

Remediation sourceCVE/CNA references

CWE sourceOther authority

NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

2023-06-14CVE published

2025-02-28Fixed release or patch reference recorded

ENISA EUVD · EUVD-2023-32017↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

Microsoft Exchange Server Remote Code Execution Vulnerability

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

ENISA European Vulnerability Database

EUVD-2023-32017

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication

Microsoft Exchange Server Remote Code Execution Vulnerability

National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

EUVD-2023-32017

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.