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CVE-2015-2423: Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Window

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This week
MEDIUM 4.3WATCHLISTDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2015-2423 is a medium-severity flaw (CVSS 4.3) affecting excel, office, powerpoint. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, Windows 10, Excel 2007 SP3, PowerPoint 2007 SP3, Visio 2007 SP3, Word 2007 SP3, Office 2010 SP2, Excel 2010 SP2, PowerPoint 2010 SP2, Visio 2010 SP2, Word 2010 SP2, Excel 2013 SP1, PowerPoint 2013 SP1, Visio 2013 SP1, Word 2013 SP1, Excel 2013 RT SP1, PowerPoint 2013 RT SP1, Visio 2013 R

Why this priority

  • EPSS top 3%: very likely to be exploited
  • On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score4.3 (Medium)
EPSS exploit chance19.9% (top 3%)
CISA exploited listNo
WeaknessCWE-200
Published2015-08-15
Last modified2026-10-14
Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Share: LinkedIn · X · Reddit

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

microsoft excel DOWNGRADE
Affected: 2007 sp3 · 2010 sp2 · 2013 sp1
Fixed in: no fixed release known
Safe to downgrade to: a release before 2007
1. Check installed version
apt-cache policy excel || rpm -q excel || excel --version
2. No fixed release: DOWNGRADE to a release before 2007 (Debian / Ubuntu)
apt-cache madison excel sudo apt install excel=<VERSION_BEFORE_2007> sudo apt-mark hold excel
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list excel sudo dnf downgrade excel-<VERSION_BEFORE_2007> sudo dnf versionlock add excel
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
microsoft office DOWNGRADE
Affected: 2010 sp2
Fixed in: no fixed release known
Safe to downgrade to: a release before 2010
1. Check installed version
apt-cache policy office || rpm -q office || office --version
2. No fixed release: DOWNGRADE to a release before 2010 (Debian / Ubuntu)
apt-cache madison office sudo apt install office=<VERSION_BEFORE_2010> sudo apt-mark hold office
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list office sudo dnf downgrade office-<VERSION_BEFORE_2010> sudo dnf versionlock add office
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
microsoft powerpoint DOWNGRADE
Affected: 2007 sp3 · 2010 sp2 · 2013 sp1
Fixed in: no fixed release known
Safe to downgrade to: a release before 2007
1. Check installed version
apt-cache policy powerpoint || rpm -q powerpoint || powerpoint --version
2. No fixed release: DOWNGRADE to a release before 2007 (Debian / Ubuntu)
apt-cache madison powerpoint sudo apt install powerpoint=<VERSION_BEFORE_2007> sudo apt-mark hold powerpoint
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list powerpoint sudo dnf downgrade powerpoint-<VERSION_BEFORE_2007> sudo dnf versionlock add powerpoint
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
microsoft visio DOWNGRADE
Affected: 2007 sp3 · 2010 sp2 · 2013 sp1 · 2016
Fixed in: no fixed release known
Safe to downgrade to: a release before 2007
1. Check installed version
apt-cache policy visio || rpm -q visio || visio --version
2. No fixed release: DOWNGRADE to a release before 2007 (Debian / Ubuntu)
apt-cache madison visio sudo apt install visio=<VERSION_BEFORE_2007> sudo apt-mark hold visio
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list visio sudo dnf downgrade visio-<VERSION_BEFORE_2007> sudo dnf versionlock add visio
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
microsoft word DOWNGRADE
Affected: 2007 sp3 · 2010 sp2 · 2013 sp1 · 2016
Fixed in: no fixed release known
Safe to downgrade to: a release before 2007
1. Check installed version
apt-cache policy word || rpm -q word || word --version
2. No fixed release: DOWNGRADE to a release before 2007 (Debian / Ubuntu)
apt-cache madison word sudo apt install word=<VERSION_BEFORE_2007> sudo apt-mark hold word
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list word sudo dnf downgrade word-<VERSION_BEFORE_2007> sudo dnf versionlock add word
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
microsoft internet explorer DOWNGRADE
Affected: 7 · 8 · 9 · 10 · 11
Fixed in: no fixed release known
Safe to downgrade to: a release before 7
1. Check installed version
apt-cache policy internet-explorer || rpm -q internet-explorer || internet-explorer --version
2. No fixed release: DOWNGRADE to a release before 7 (Debian / Ubuntu)
apt-cache madison internet-explorer sudo apt install internet-explorer=<VERSION_BEFORE_7> sudo apt-mark hold internet-explorer
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list internet-explorer sudo dnf downgrade internet-explorer-<VERSION_BEFORE_7> sudo dnf versionlock add internet-explorer
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-2423?

excel: downgrade or apply the listed mitigation; office: downgrade or apply the listed mitigation; powerpoint: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-2423 being exploited?

CVE-2015-2423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-2423 affect?

CVE-2015-2423 affects excel, office, powerpoint. Severity is medium (CVSS 4.3). Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, Windows 10, Excel 2007 SP3, PowerPoint 2007 SP3, Visio 2007 SP3, Word 2007 SP3

How urgent is CVE-2015-2423?

Priority 44/100. EPSS top 3%: very likely to be exploited; On your watchlist

Software pages

Windows vulnerabilities · Windows Server vulnerabilities · Microsoft Office vulnerabilities · Internet Explorer vulnerabilities

Related CVEs

References

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