Background exploitation KEV catalog

CVE-2017-11826

Microsoft Office Remote Code Execution Vulnerability

Microsoft Office 2010, SharePoint Enterprise Server 2010, SharePoint Server 2010, Web Applications, Office Web Apps Server 2010 and 2013, Word Viewer, Word 2007, 2010, 2013 and 2016, Word Automation Services, and Office Online Server allow…

CheckOps priority index

7.4/10 Patch within 7 days

Severity7.8

Probability8.1

Exploitation3/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 81.3% higher than 99.6% of CVEs

CVSS 3.1 7.8 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:

Exploited for 1,706 days 03 Mar 2022

CISA due date 24 Mar 2022 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 3 / 5

KEV catalog (CISA)03 Mar 2022
Exploited in EUVD (ENISA)03 Mar 2022
Used by ransomwareno
EPSS above 10 %81.3%
No account, over the networkno

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply updates per vendor instructions.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

Affected products

Microsoft OfficeOffice

Affected versions

Microsoft Office 2010, SharePoint Enterprise Server 2010, SharePoint Server 2010, Web Applications, Office Web Apps Server 2010 and 2013, Word Viewer, Word 2007, 2010, 2013 and 2016, Word Automation Services, Office Online Server.

Weaknesses (CWE)

CWE-119

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

13 Oct 2017
Published
03 Mar 2022
Exploitation reported (ENISA)
03 Mar 2022
Added to the KEV catalog
24 Mar 2022
CISA remediation due date
12 Oct 2026
EPSS peak: 81.3%

References

Other exploited vulnerabilities from the same vendor

CVE-2026-96951Microsoft Windows Command Injection Vulnerability
5.6 · Actively exploited
CVE-2026-65660Microsoft SharePoint Code Injection Vulnerability
5.0 · Actively exploited
CVE-2026-85880Microsoft Windows Heap-Based Buffer Overflow Vulnerability
4.3 · Actively exploited
CVE-2026-81963Microsoft Windows Link Following Vulnerability
4.3 · Actively exploited
CVE-2019-1068Microsoft SQL Server Remote Code Execution Vulnerability
7.0 · Actively exploited
CVE-2026-69836Microsoft Entra
5.3 · Actively exploited