Microsoft Office Memory Corruption Vulnerability

CheckOps priority index

6.6/10 Patch within 7 days

Severity7.8

Probability5.8

Exploitation3/5

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

EPSS · today 57.6% higher than 99.1% 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 %57.6%
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

Microsoft Word 2007 SP2, Office 2010 SP2, Word 2013 SP1, Word 2013 RT SP1, Word 2016, Word for Mac 2011, Word 2016 for Mac, Office Compatibility Pack SP3, Word Viewer, Word Automation Services on SharePoint Server 2010 SP2, Word Automation Services on SharePoint Server 2013 SP1, Office Web Apps 2010 SP2, Office Web Apps Server 2013 SP1, and Office Online Server allow remote attackers to execute arbitrary code via a crafted RTF document, aka "Microsoft Office Memory Corruption Vulnerability."

Affected products

Office

Weaknesses (CWE)

CWE-119

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

14 Oct 2016
Published
03 Mar 2022
Exploitation reported (ENISA)
03 Mar 2022
Added to the KEV catalog
24 Mar 2022
CISA remediation due date
26 Sept 2026
EPSS peak: 57.6%

References

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