CVE-2014-1776
Status: AnalyzedCritical (9.8)⚠ Active exploitation
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
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Base score: 9.8
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 83%
- Percentile among all scored CVEs: 100
- Score date: 10/7/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
CISA KEV — actively exploited
- Added to catalog: 1/28/2022
- Remediation due date: 7/28/2022
- Known ransomware use: Unknown
🎯 ATT&CK techniques
How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.
- Exploitation
T1190Exploit Public-Facing Applicationinitial access95 % - Primary impact
T1059Command and Scripting Interpreterexecution90 % - Secondary impact
T1499.004Application or System Exploitationimpact60 %
Vulnerabilidad use-after-free en IE remoto sin autenticación (AV:N/PR:N/UI:N). Explotación T1190 por aplicación expuesta. Impacto primario: ejecución arbitraria de código (T1059). Secundario: DoS por corrupción de memoria.
Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.
🛡️ ATT&CK mitigations that cover these techniques
Affected technologies (1)
CWEs
- CWE-416
- CWE-416
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
- 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
Raw JSON (NVD)
Show
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