CVE-2014-1776
Microsoft Internet Explorer Memory Corruption Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 28 July 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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."
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 82.68% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 28 January 2022 · due 28 July 2022
- Weakness
- CWE-416
- Affected
- microsoft/internet explorer
- Source
- secure@microsoft.com
EPSS moved from 82.7% on 24 September 2026 to 82.7% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply updates per vendor instructions. https://learn.microsoft.com/en-us/security-updates/SecurityBulletins/2014/ms14-021?redirectedfrom=MSDN; https://nvd.nist.gov/vuln/detail/CVE-2014-1776
References
- http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspxBroken Link, Mitigation
- http://secunia.com/advisories/57908Broken Link
- http://securitytracker.com/id?1030154Broken Link, Third Party Advisory, VDB Entry
- http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.htmlBroken Link
- http://www.kb.cert.org/vuls/id/222929Mitigation, Third Party Advisory, US Government Resource
- http://www.osvdb.org/106311Broken Link
- http://www.securityfocus.com/bid/67075Broken Link, Third Party Advisory, VDB Entry
- http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/Exploit, Third Party Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021Patch, Vendor Advisory
- https://technet.microsoft.com/library/security/2963983Mitigation, Patch, Vendor Advisory
- http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspxBroken Link, Mitigation
- http://secunia.com/advisories/57908Broken Link
- http://securitytracker.com/id?1030154Broken Link, Third Party Advisory, VDB Entry
- http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.htmlBroken Link
- http://www.kb.cert.org/vuls/id/222929Mitigation, Third Party Advisory, US Government Resource
- http://www.osvdb.org/106311Broken Link
- http://www.securityfocus.com/bid/67075Broken Link, Third Party Advisory, VDB Entry
- http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/Exploit, Third Party Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021Patch, Vendor Advisory
- https://technet.microsoft.com/library/security/2963983Mitigation, Patch, Vendor Advisory
- https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-scriptThird Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scriptsThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.