vciy

CVE-2021-1716

INDEX BUILT · 2026-09-20

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Microsoft Word Remote Code Execution Vulnerability

CVE-2021-17164 of 4 sources documented this
32

rank 32 = 1 + 23 + 0 + 8 + 0

rank@v1 · scheduled

Someone is already using it

CISA KEV catalog · public proof-of-concept · FIRST EPSS

EPSS 0.03600  ·  without this subject the record ranks 31

What it costs you if it fires

NVD CVSS base score, then the CNA's own

CVSS 9.3, from NVD  ·  without this subject the record ranks 9

It is getting worse, not staying still

FIRST EPSS series, rescorings and bad loads removed

no persisting rise in 365 days  ·  without this subject the record ranks 32

How much of the world it touches

NVD CPE configurations

11 products in the CPE ranges  ·  without this subject the record ranks 24

Someone else already set the date

CISA KEV remediation due date

no CISA due date  ·  without this subject the record ranks 32

Unaudited dollar value2 of 3 inputs carry a receipt
Exposure$180,000over the next 30 days, if this record is yours
Movement-$597,000on 2024-04-30, the last material move, 2 years, 3 months before this reading
Basisassumeda published average, not your estate

$180,000 = $4.99M incident cost x 1 exposure x 0.036 likelihood

udv@v1 · unaudited · wrong for you until you say what you run

$4.99M is the cost of a breach that happened, from IBM Cost of a Data Breach Report 2026, global average. It is not the value of any asset of yours. That average already covers breaches of every severity, so scaling it by exposure understates a partial-impact record. That is an assumption, not a measurement. Your own asset value goes in the decision record.

Hindsight · the state

0.036EPSSNOT IN KEVas of 2026-09-20
Severity7.8 HIGHreceipt
Harmtotal lossreceipt
Exploitationnone in held sources
Defenseno fix version held
Movementfallenreceipt
PLATEAU10Minimal movement since 2024-03-31, 880 days at 0.04, as of 2026-08-28. arc-rules@v1

Foresight · where to check next

No weakness class or product neighbourhood is held for this record, so this index cannot name anywhere to check next. That is an absence in the record, not a finding about the software.

Color is a claim, not decoration:the hostile worldthe defenseno signal

Sources disagree here.

Severity score
Microsoft7.8 HIGHreceipt
NVD9.3 CRITICALreceipt
Scoring standard
MicrosoftCVSS v3.1receipt
NVDCVSS v2.0receipt

Both shown, dated. We don't pick winners. disagreement-rules@v1

Running Microsoft Office Web Apps Server 2013…? Check your version

A deterministic range check against the ranges this record publishes. It tells you where a version sits in the record, not whether your deployment is exploitable. No account needed.

Watch this record

Matches your own product list against every record this index holds, and tells you when one of them moves.

What counts as a move

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Record your call

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AcceptDeferPatch by…Not affectedMitigated

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Harm, if it fires from the vector and the weakness

Written for the ticket you're about to file.

Reachneeds local access · no privileges required · user interaction required · low attack complexityreceipt
ImpactComplete confidentiality, integrity and availability lossreceipt
Scored fromCVSS v3.1 · the CNA's vectorreceipt
Weakness classNo CWE mapping in held sources.

CISA KEV & Federal Remediation Deadline from the record and CISA

The fix, and how long it's been waiting.

Fixed inNo fix version in held sources, as the index stood on 28 Aug 2026.
Patch available sinceNo dated patch-availability record in held sources. The index holds reference URLs without dates and only the current revision of the CVE record, so the day a fix first existed cannot be derived. Only the versions it landed in.

Exploit Status & Known PoCs a ladder, not a score

Current rung: Nothing observed in held sources.

  • RUNG 1Nothing observed in held sources
  • RUNG 2Proof-of-concept published
  • RUNG 3Exploited in the wild · CISA KEV listed
  • RUNG 4Ransomware campaign use known

Authority who says so

CVSS, the CNA7.8 HIGHreceipt
CVSS, NVD9.3 CRITICALreceipt
Exploit probability0.036 · top 11% of all CVEsreceipt
Blast breadth6 products across 1 vendorderived
Assigned bymicrosoftreceipt
Recorded changes74 · last 19 Sep 2026derived

Affected & Fixed Versions as published

Affected productMicrosoft Office Web Apps Server 2013 Service Pack 1; Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Enterprise Server 2013 Service Pack 1; Microsoft SharePoint Server 2019…receipt
Published rangesmicrosoft office 2010; microsoft office 2019; microsoft office web apps 2010; microsoft office web apps server 2013receipt
Show all 11 published ranges
microsoft office 2010
microsoft office 2019
microsoft office web apps 2010
microsoft office web apps server 2013
microsoft sharepoint enterprise server 2013
microsoft sharepoint enterprise server 2016
microsoft sharepoint server 2010
microsoft sharepoint server 2019
microsoft word 2010
microsoft word 2013
microsoft word 2016

A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.

Did this affect your environment?Answering needs an account.

What it is stated by the CNA

Microsoft Word Remote Code Execution Vulnerability receipt

NVD's analysis a second authority

severity
9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C
affected versions
microsoft office 2010; microsoft office 2019; microsoft office web apps 2010; and 8 more, listed in full below
also scored by
[email protected] 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H · [email protected] 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

The CNA scored it 7.8 and NVD 9.3. Both are shown because both were published; we do not pick one.

check it yourself msrc.microsoft.com receipt

Dated events

2022-01-06EPSS moved 0.10 to 0.322023-06-27EPSS moved 0.02 to 0.382025-03-30EPSS moved 0.07 to 0.02

Movement the material steps

14 Apr 20210.09575
6 Jan 20220.32208 · crossed 0.10
4 Feb 20220.12761
1 Apr 20220.01528 · crossed 0.10
7 Mar 20230.00302 · scoring model v2023.03.01
31 May 20230.27533 · crossed 0.10
14 Jun 20230.02309 · crossed 0.10
27 Jun 20230.38247 · crossed 0.10
11 Jul 20230.02876 · crossed 0.10
12 Oct 20230.15220 · crossed 0.10
24 Oct 20230.04080 · crossed 0.10
19 Dec 20230.10568 · crossed 0.10
1 Jan 20240.04452 · crossed 0.10
16 Jan 20240.10351 · crossed 0.10
30 Jan 20240.06521 · crossed 0.10
15 Feb 20240.27661 · crossed 0.10
29 Feb 20240.10070
31 Mar 20240.07927 · crossed 0.10
15 Apr 20240.13299 · crossed 0.10
30 Apr 20240.01331 · crossed 0.10
17 Mar 20250.02262 · scoring model v2025.03.14
15 Jun 20260.03614 · scoring model v2026.06.15
28 Aug 20260.036
Show all 74 observations
14 Apr 20210.09575
6 Jan 20220.32208
4 Feb 20220.12761
1 Apr 20220.01528
2 Apr 20220.01648
31 Jul 20220.01789
7 Mar 20230.00302
8 Mar 20230.00329
22 Mar 20230.00306
6 Apr 20230.00378
18 Apr 20230.01186
4 May 20230.00850
16 May 20230.02740
31 May 20230.27533
14 Jun 20230.02309
27 Jun 20230.38247
11 Jul 20230.02876
24 Jul 20230.03022
7 Aug 20230.09553
19 Aug 20230.03069
2 Sep 20230.05463
15 Sep 20230.03523
28 Sep 20230.06784
12 Oct 20230.15220
24 Oct 20230.04080
8 Nov 20230.06613
21 Nov 20230.05507
5 Dec 20230.04062
19 Dec 20230.10568
1 Jan 20240.04452
16 Jan 20240.10351
30 Jan 20240.06521
15 Feb 20240.27661
29 Feb 20240.10070
15 Mar 20240.15411
31 Mar 20240.07927
15 Apr 20240.13299
30 Apr 20240.01331
17 May 20240.01174
1 Jun 20240.01182
17 Jun 20240.01117
4 Jul 20240.01351
22 Jul 20240.01263
9 Aug 20240.01123
26 Aug 20240.01117
9 Oct 20240.01576
1 Nov 20240.01563
16 Nov 20240.01589
3 Dec 20240.01569
17 Dec 20240.01713
21 Feb 20250.02133
9 Mar 20250.02869
17 Mar 20250.02262
19 Mar 20250.03032
22 Mar 20250.02572
25 Mar 20250.02155
29 Mar 20250.07246
30 Mar 20250.02155
28 May 20250.02221
5 Jun 20250.04486
11 Jun 20250.03413
12 Oct 20250.0437
18 Nov 20250.03858
21 Nov 20250.0437
3 Dec 20250.05381
13 Dec 20250.04036
14 Dec 20250.04355
23 Dec 20250.05513
27 Dec 20250.05381
28 Dec 20250.05513
11 Mar 20260.07302
21 Apr 20260.08568
15 Jun 20260.03614
28 Aug 20260.036

74 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt

The full biography

EPSS 0.036Published2021-01-12Index as of2026-08-28

The record had been public for 5 years, 7 months when this index was last written.

Published 2021-01-12 receipt · Index as of 2026-08-28 derived

Siblings and hubs

Records related to this one

Its defect family

microsoft office

Of the 18 records in this family, this is the only one whose title names word.

Grouped by shared product and weakness, not by shared vulnerability. Each record's own state is on its own page.

Family membership: computed, pro@dim2000

This record is one of a group, and the group's page describes all of them. This page is kept and dated, and the defect family's own page is the one we offer for indexing: the whole group.

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What usually comes next

Everything above needs no account. What is below is work: assembling it, scoping it to your estate, watching it, and handing it to someone else.

Everything on this page is free. Public data. Withholding it protects nothing.