Security Resilience

CVE-2019-1429

Memory Safety in Microsoft Internet Explorer 10 … 9

CISA KEVActive ExploitationEUVD ExploitedPublic PoCMemory Safety
Published
12 November 2019
Modified
14 January 2026
KEV Added
03 November 2021
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.77 99.6th percentile
Risk Priority 82 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2019-1429 is a high-severity Use After Free (CWE-416) vulnerability in Microsoft Internet Explorer. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique OS Credential Dumping (T1003); ranked in the top 0.4% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

A remote code execution vulnerability exists in the scripting engine of Internet Explorer due to improper handling of objects in memory. The flaw is tracked as CVE-2019-1429 and is distinct from several related issues in the same component. It is classified under CWE-416 (use after free) and CWE-787 (out-of-bounds write) and carries a CVSS 3.1 score of 7.5 reflecting network attack vector, high attack complexity, required user interaction, and full confidentiality, integrity, and availability impact.

An unauthenticated remote attacker can exploit the issue by convincing a user to visit a specially crafted web page in Internet Explorer. Successful exploitation allows arbitrary code execution in the context of the current user. The vulnerability affects the scripting engine's memory management routines and does not require prior authentication or elevated privileges on the target system.

Microsoft's security advisory and the CISA Known Exploited Vulnerabilities catalog both reference official patches that address the memory corruption. Administrators are advised to apply the updates released through the standard Microsoft Update channels to eliminate the exposure.

The presence of CVE-2019-1429 in the CISA catalog confirms observed in-the-wild exploitation, underscoring the need for prompt remediation on any remaining Internet Explorer installations.

EU & UK References

Vulnerability Data

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2019-1426, CVE-2019-1427, CVE-2019-1428.

CWE(s)
CWE-416CWE-787
KEV Date Added
03 November 2021

Related Threats

MITRE ATT&CK Enterprise Techniques

T1003 OS Credential Dumping Credential Access
Adversaries may attempt to dump credentials to obtain account login and credential material, normally in the form of a hash or a clear text password.
attack.mitre.org →
T1003.001 LSASS Memory Credential Access
Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).
attack.mitre.org →
T1003.002 Security Account Manager Credential Access
Adversaries may attempt to extract credential material from the Security Account Manager (SAM) database either through in-memory techniques or through the Windows Registry where the SAM database is stored.
attack.mitre.org →
T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
T1003.008 /etc/passwd and /etc/shadow Credential Access
Adversaries may attempt to dump the contents of <code>/etc/passwd</code> and <code>/etc/shadow</code> to enable offline password cracking.
attack.mitre.org →
T1006 Direct Volume Access Stealth
Adversaries may directly access a volume to bypass file access controls and file system monitoring.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2020-0968Same product: Microsoft Internet Explorerboth on KEV
CVE-2020-1380Same product: Microsoft Internet Explorerboth on KEV
CVE-2018-8653Same product: Microsoft Internet Explorerboth on KEV
CVE-2019-1367Same product: Microsoft Internet Explorerboth on KEV
CVE-2020-0878Same product: Microsoft Internet Explorerboth on KEV
CVE-2020-1020Same product: Microsoft Windows 10 1507both on KEV
CVE-2018-8373Same product: Microsoft Internet Explorerboth on KEV
CVE-2020-1054Same product: Microsoft Windows 10 1507both on KEV
CVE-2020-0938Same product: Microsoft Windows 10 1507both on KEV
CVE-2020-1027Same product: Microsoft Windows 10 1507both on KEV

Affected Assets

microsoft
internet explorer
10, 11, 9

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 3 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V1.4.3

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-416 CWE-787

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

ID.RA-01 partial match
blocks

Vulnerability identification processes can discover use-after-free issues via scanning or analysis but do not prevent their introduction.

PR.PS-02 partial match
blocks

Routine patching removes known use-after-free instances after they have been introduced in released software.

PR.PS-06 partial match
blocks

Secure SDLC practices directly incorporate memory-safety tooling and reviews that prevent most use-after-free defects.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.5.30 ICT readiness for business continuity partial match
removes

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (higher-evidence rows only; rows rated `none` are excluded).

Oracle Linux 8 (1 rule)
  • V-248592 OL 8 must clear memory when it is freed to prevent use-after-free attacks. blocks CWE-416
RHEL 8 (1 rule)
  • V-230279 RHEL 8 must clear memory when it is freed to prevent use-after-free attacks. blocks CWE-416
RHEL 9 (1 rule)
  • V-257794 RHEL 9 must clear memory when it is freed to prevent use-after-free attacks. blocks CWE-416

References