How severe is CVE-2014-4123?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2014-4123 known to be exploited?

Yes. CVE-2014-4123 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-25), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.

Vulnerability in Microsoft Internet Explorer

CVE-2014-4123

Microsoft Internet Explorer 7 through 11 allows remote attackers to gain privileges via a crafted web site, aka "Internet Explorer Elevation of Privilege Vulnerability," as exploited in the wild in October 2014, a different vulnerability than CVE-2014-4124.

Published 2014-10-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.471 (98.8th percentile), scored 2026-10-20.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.471 · newest: 0.471 · change: 0.000

Affected products

Microsoft Internet Explorer — versions 7, 8, 9
Microsoft Windows 7
Microsoft Windows 8
Microsoft Windows 8.1
Microsoft Windows Rt
Microsoft Windows Rt 8.1
Microsoft Windows Server 2003
Microsoft Windows Server 2008 — versions r2
Microsoft Windows Server 2012 — versions r2
Microsoft Windows Vista

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-05-25. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-06-15.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

blogs.technet.com/b/srd/archive/2014/10/14/accessing-risk-for-the-october-2014-… (Not Applicable, Vendor Advisory)
secunia.com/advisories/60968 (Broken Link, third-party-advisory)
www.securitytracker.com/id/1031018 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-056 (vendor-advisory, Patch, Vendor Advisory)
www.securityfocus.com/bid/70326 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2014-4123?: CVE-2014-4123 is a high-severity vulnerability in Microsoft Internet Explorer. CVSS score: 8.8/10. Published 2014-10-15.
How severe is CVE-2014-4123?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2014-4123 known to be exploited?: Yes. CVE-2014-4123 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-25), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.