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
Published Apr 27, 2014 ·Due Jul 28, 2022
9.8
CRITICALCVSS 3.1
EPSS 82.68%
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."
Affected products
No data.
Configuration 1
- 6
Running on/with
- n/a
- n/a
- n/a
Configuration 2
- 7
Running on/with
- n/a
- n/a
- n/a
- n/a
- n/a
Configuration 3
- 8
Running on/with
- n/a
- n/a
- n/a
- r2
- n/a
- n/a
- n/a
Configuration 4
- 9
Running on/with
- n/a
- n/a
- r2
- n/a
Configuration 5
- 10
Running on/with
- n/a
- n/a
- n/a
- r2
- n/a
Configuration 6
- 11
Running on/with
- n/a
- n/a
- n/a
- r2
- r2
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:C/I:C/A:C
Date Added
Jan 28, 2022
Patch Due
Jul 28, 2022
Required Action
Apply updates per vendor instructions.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Feb 10, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (37 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 82.68% (0.82682) | 99.66th | v5 (v2026.06.15) |
| Jun 15, 2026 | 88.01% (0.88013) | 99.74th | v5 (v2026.06.15) |
| Apr 3, 2026 | 83.27% (0.83265) | 99.26th | v4 (v2025.03.14) |
| Apr 2, 2026 | 81.60% (0.81601) | 99.18th | v4 (v2025.03.14) |
| Apr 1, 2026 | 83.27% (0.83265) | 99.26th | v4 (v2025.03.14) |
| Mar 31, 2026 | 81.60% (0.81601) | 99.18th | v4 (v2025.03.14) |
| Mar 10, 2026 | 80.19% (0.80186) | 99.09th | v4 (v2025.03.14) |
| Feb 20, 2026 | 81.84% (0.81844) | 99.17th | v4 (v2025.03.14) |
| Feb 18, 2026 | 80.45% (0.80454) | 99.09th | v4 (v2025.03.14) |
| Dec 28, 2025 | 78.49% (0.78494) | 98.98th | v4 (v2025.03.14) |
| Dec 27, 2025 | 76.48% (0.76485) | 98.89th | v4 (v2025.03.14) |
| Nov 19, 2025 | 78.49% (0.78494) | 99.11th | v4 (v2025.03.14) |
| Oct 28, 2025 | 80.06% (0.80062) | 99.06th | v4 (v2025.03.14) |
| Oct 27, 2025 | 78.23% (0.78227) | 98.98th | v4 (v2025.03.14) |
| Oct 1, 2025 | 80.06% (0.80062) | 99.08th | v4 (v2025.03.14) |
| Aug 1, 2025 | 78.23% (0.78227) | 98.98th | v4 (v2025.03.14) |
| Jun 28, 2025 | 76.48% (0.76485) | 98.87th | v4 (v2025.03.14) |
| Jun 15, 2025 | 72.88% (0.72875) | 98.69th | v4 (v2025.03.14) |
| May 30, 2025 | 78.69% (0.78691) | 98.98th | v4 (v2025.03.14) |
| Apr 4, 2025 | 76.91% (0.76913) | 98.91th | v4 (v2025.03.14) |
| Mar 30, 2025 | 80.20% (0.80198) | 99.06th | v4 (v2025.03.14) |
| Mar 29, 2025 | 77.88% (0.77884) | 98.72th | v4 (v2025.03.14) |
| Mar 23, 2025 | 80.20% (0.80198) | 99.05th | v4 (v2025.03.14) |
| Mar 19, 2025 | 74.22% (0.74216) | 98.75th | v4 (v2025.03.14) |
| Mar 17, 2025 | 64.76% (0.64760) | 98.31th | v4 (v2025.03.14) |
| Dec 17, 2024 | 94.10% (0.94104) | 99.37th | v3 (v2023.03.01) |
| Dec 12, 2024 | 95.99% (0.95988) | 99.55th | v3 (v2023.03.01) |
| Apr 25, 2024 | 96.56% (0.96565) | 99.60th | v3 (v2023.03.01) |
| Jan 22, 2024 | 96.77% (0.96765) | 99.60th | v3 (v2023.03.01) |
| Dec 8, 2023 | 96.92% (0.96925) | 99.65th | v3 (v2023.03.01) |
| Oct 22, 2023 | 97.24% (0.97243) | 99.78th | v3 (v2023.03.01) |
| Jul 8, 2023 | 97.31% (0.97312) | 99.79th | v3 (v2023.03.01) |
| May 22, 2023 | 97.26% (0.97257) | 99.74th | v3 (v2023.03.01) |
| May 8, 2023 | 97.17% (0.97175) | 99.67th | v3 (v2023.03.01) |
| Mar 7, 2023 | 97.24% (0.97243) | 99.68th | v3 (v2023.03.01) |
| Mar 6, 2023 | 59.82% (0.59823) | 98.90th | v2 (v2022.01.01) |
| Feb 4, 2022 | 59.82% (0.59823) | 98.59th | v2 (v2022.01.01) |
References (13)
- http://blogs.technet.com/b/srd/archive/2014/04/30/protection-strategies-for-the-security-advisory-2963983-ie-0day.aspx x_refsource_CONFIRMBroken LinkMitigation
- http://secunia.com/advisories/57908 third-party-advisoryx_refsource_SECUNIABroken Link
- http://securitytracker.com/id?1030154 vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry
- http://www.fireeye.com/blog/uncategorized/2014/04/new-zero-day-exploit-targeting-internet-explorer-versions-9-through-11-identified-in-targeted-attacks.html x_refsource_MISCBroken Link
- http://www.kb.cert.org/vuls/id/222929 third-party-advisoryx_refsource_CERT-VNMitigationThird Party AdvisoryUS Government Resource
- http://www.osvdb.org/106311 vdb-entryx_refsource_OSVDBBroken Link
- http://www.securityfocus.com/bid/67075 vdb-entryx_refsource_BIDBroken LinkThird Party AdvisoryVDB Entry
- http://www.signalsec.com/cve-2014-1776-ie-0day-analysis/ x_refsource_MISCExploitThird Party Advisory
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-021 vendor-advisoryx_refsource_MSPatchVendor Advisory
- https://technet.microsoft.com/library/security/2963983 x_refsource_CONFIRMMitigationPatchVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2014-1776 government-resourceUS Government Resource
- https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-detection-script Third Party Advisory
- https://www.vicarius.io/vsociety/posts/cve-2014-1776-use-after-free-vulnerability-in-microsoft-internet-explorer-mitigation-scripts Third Party Advisory
Change history (0)
No recorded changes yet.