CVE-2023-23396

mediumpriority · track · 37EPSS 0.038 · 90 %ileexploit · PoCEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

3.83% (90th) EPSS

CVSS 6.5 · medium

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · msrc_csaf

EPSS · scored 2026-10-27

Microsoft Excel Denial of Service Vulnerability

remediations

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

A vendor fix is available.

FixedMicrosoft Office Online Servermsrc_csaf
16.0.10396.20000:Security Update:https://support.microsoft.com/help/5002356
https://support.microsoft.com/help/5002356
FixedMicrosoft Office Web Apps Server 2013 Service Pack 1msrc_csaf
15.0.5537.1000:Security Update:https://support.microsoft.com/kb/5002362
https://support.microsoft.com/kb/5002362

cvss

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

6.5

010

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

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.16.5mediumAV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hsecondary · secure@microsoft.com USexploitability 2.8 · impact 3.6

v3.16.2mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:Psecondary · CVSS-BT (t0sche)

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USprimaryCWE-400USCWE-404US

exploits (1)

Public proof-of-concept and weaponised exploit code.

LucaBarile/CVE-2023-23396Exploit and report for CVE-2023-23396.PoC · poc_in_github

affected products (10)

Products and version ranges known to be affected.

Microsoft Microsoft Office Online Server16.0.1 → 16.0.10396.20000enisa_euvdEU
Microsoft Microsoft Office Web Apps Server 2013 Service Pack 115.0.1 → 15.0.5537.1000enisa_euvdEU
Microsoft Corp Microsoft Office Web Apps Server 2013 Service Pack 1all versionsfstec_bduRU
Microsoft Corp Office Online Serverall versionsfstec_bduRU
Microsoft Office Online Serverall versionsfixedmsrc_csafUS
Microsoft Office Online Server< 16.0.10396.20000msrc_csafUS
Microsoft Office Web Apps Server 2013 Service Pack 1all versionsfixedmsrc_csafUS
Microsoft Office Web Apps Server 2013 Service Pack 1< 15.0.5537.1000msrc_csafUS
microsoft office online serverall versionsnvdUScpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:*
microsoft office web apps server= 2013nvdUScpe:2.3:a:microsoft:office_web_apps_server:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

msrc_CVE-2023-23396Microsoft Excel Denial of Service Vulnerability2023-03-14csaf · 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 msrc_csaf nvd NVD CVE.org MITRE

published 2023-03-14modified 2026-06-17

related (9,612)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-28318US	—OT critical	43.7% (99th)	KEV	2026-06-04
SolarWinds Serv-U is susceptible to specially crafted POST requests that crash the Serv-U service without authentication using Content-Encoding: deflate. Mitigation steps are provi…
CVE-2026-45498US	high7.5OT critical	63.1% (99th)	KEV	2026-05-20
Microsoft Defender Denial of Service Vulnerability
CVE-2023-44487US	high7.5OT critical	100.0% (100th)	KEV	2023-10-10
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through…
CVE-2023-38180US	—OT critical	14.1% (97th)	KEV	2023-08-08
.NET and Visual Studio Denial of Service Vulnerability
CVE-2021-44228US	critical10.0OT critical	100.0% (100th)	KEV	2021-12-10
Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect agai…

+9607 more

references (4)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan