CVE-2014-1776
CVE-2014-1776 is a critical-severity vulnerability in Microsoft Internet Explorer with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-01-28). The underlying weakness is classified as CWE-416.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 10.0
- EPSS exploit prediction: 88% (100th percentile)
- Actively exploited: Yes — listed in CISA KEV (added 2022-01-28)
- EU (EUVD) id: EUVD-2014-1850
- EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-01-28)
- Weakness: CWE-416
- Affected product: Microsoft Internet Explorer
- Published:
- Last modified:
Description
Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014. NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that "VGX.DLL does not contain the vulnerable code leveraged in this exploit. Disabling VGX.DLL is an exploit-specific workaround that provides an immediate, effective workaround to help block known attacks."
Frequently asked questions
- What is CVE-2014-1776?
- Use-after-free vulnerability in Microsoft Internet Explorer 6 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via vectors related to the CMarkup::IsConnectedToPrimaryMarkup function, as exploited in the wild in April 2014. NOTE: this issue originally emphasized VGX.DLL, but Microsoft clarified that "VGX.DLL does not contain the vulnerable code leveraged in this exploit. Disabling VGX.DLL is an exploit-specific workaround that provides an immediate, effective workaround to help block known attacks."
- How severe is CVE-2014-1776?
- CVE-2014-1776 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2014-1776 being actively exploited?
- Yes. CVE-2014-1776 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-01-28, which means active exploitation has been confirmed. It should be prioritised for remediation.
- What products are affected by CVE-2014-1776?
- CVE-2014-1776 primarily affects Microsoft Internet Explorer. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2014-1776?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
- Does CVE-2014-1776 have an EU (EUVD) identifier?
- Yes. CVE-2014-1776 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2014-1850. It is also flagged as exploited in the EUVD (since 2022-01-28).
- When was CVE-2014-1776 published?
- CVE-2014-1776 was published on 2014-04-27 and last updated on 2026-06-17.
References
- http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx
- http://secunia.com/advisories/57908
- http://securitytracker.com/id?1030154
- http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html
- http://www.kb.cert.org/vuls/id/222929
- http://www.osvdb.org/106311
- http://www.securityfocus.com/bid/67075
- http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021
- https://technet.microsoft.com/library/security/2963983
- https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script
- https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scripts
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776
Affected products (6)
- cpe:2.3:a:microsoft:internet_explorer:6:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:internet_explorer:7:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:internet_explorer:8:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:internet_explorer:10:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*
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