CVE-2023-21707

highpriority · track · 39EPSS 0.820 · 100 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

82.0% (100th) EPSS

CVSS 8.8 · high

Is it mine?

23 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Microsoft Exchange Server Remote Code Execution Vulnerability

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedMicrosoft Exchange Server 2013 Cumulative Update 23msrc_csaf
15.00.1497.048:Security Update:https://support.microsoft.com/help/5024296
https://support.microsoft.com/help/5024296
FixedMicrosoft Exchange Server 2016 Cumulative Update 23msrc_csaf
15.01.2507.023:Security Update:https://support.microsoft.com/help/5024296
https://support.microsoft.com/help/5024296
FixedMicrosoft Exchange Server 2019 Cumulative Update 11msrc_csaf
15.02.0986.042:Security Update:https://support.microsoft.com/help/5024296
https://support.microsoft.com/help/5024296
FixedMicrosoft Exchange Server 2019 Cumulative Update 12msrc_csaf
15.02.1118.026:Security Update:https://support.microsoft.com/help/5024296
https://support.microsoft.com/help/5024296

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.8highAV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 2.8 · impact 5.9

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-502USCWE-502USCWE-94US

exploits (1)

Public proof-of-concept and weaponised exploit code.

N1k0la-T/CVE-2023-21707CVE-2023-21707 EXPPoC · poc_in_github

affected products (23)

Products and version ranges known to be affected.

Microsoft Exchange Server 2013 Cumulative Update 23all versionscert_bundDEcpe:/a:microsoft:exchange_server_2013::cumulative_update_23
Microsoft Exchange Server 2016 Cumulative Update 23all versionscert_bundDEcpe:/a:microsoft:exchange_server_2016:cumulative_update_23
Microsoft Exchange Server 2019 Cumulative Update 11all versionscert_bundDEcpe:/a:microsoft:exchange_server_2019:cumulative_update_11
Microsoft Exchange Server 2019 Cumulative Update 12all versionscert_bundDEcpe:/a:microsoft:exchange_server_2019:cumulative_update_12
Microsoft Microsoft Exchange Server 2013 Cumulative Update 2315.00.0 → 15.00.1497.048enisa_euvdEU
Microsoft Microsoft Exchange Server 2016 Cumulative Update 2315.01.0 → 15.01.2507.023enisa_euvdEU
Microsoft Microsoft Exchange Server 2019 Cumulative Update 1115.02.0 → 15.02.0986.042enisa_euvdEU
Microsoft Microsoft Exchange Server 2019 Cumulative Update 1215.02.0 → 15.02.1118.026enisa_euvdEU
Microsoft Corp Microsoft Exchange Server≤ 2019 Cumulative Update 11fstec_bduRU
Microsoft Corp Microsoft Exchange Server≤ 2019 Cumulative Update 12fstec_bduRU
Microsoft Corp Microsoft Exchange Server≤ 2016 Cumulative Update 23fstec_bduRU
Microsoft Corp Microsoft Exchange Server≤ 2013 Cumulative Update 23fstec_bduRU
Microsoft Exchange Server 2013 Cumulative Update 23all versionsfixedmsrc_csafUS
Microsoft Exchange Server 2013 Cumulative Update 23< 15.00.1497.048msrc_csafUS
Microsoft Exchange Server 2016 Cumulative Update 23all versionsfixedmsrc_csafUS
Microsoft Exchange Server 2016 Cumulative Update 23< 15.01.2507.023msrc_csafUS
Microsoft Exchange Server 2019 Cumulative Update 11all versionsfixedmsrc_csafUS
Microsoft Exchange Server 2019 Cumulative Update 11< 15.02.0986.042msrc_csafUS
Microsoft Exchange Server 2019 Cumulative Update 12all versionsfixedmsrc_csafUS
Microsoft Exchange Server 2019 Cumulative Update 12< 15.02.1118.026msrc_csafUS

showing 20 of 23

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-0368Microsoft Exchange: Mehrere Schwachstellen ermöglichen CodeausführungDeutsch2023-02-14csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Microsoft Exchange Server 2013, Microsoft Exchange Server 2016 und Microsoft Exchange Server 2019 ausnutzen, um beliebigen Programmcode auszuführen.
msrc_CVE-2023-21707Microsoft Exchange Server Remote Code Execution Vulnerability2023-02-14csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund msrc_csaf NVD CVE.org MITRE

published 2023-02-14modified 2026-08-19

references (4)

External citations — patches, advisories, analysis.

scry

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