What is CVE-2019-0609?

CVE-2019-0609 is a high-severity vulnerability in Microsoft Chakracore, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2019-04-08.

How severe is CVE-2019-0609?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2019-0609 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Microsoft Chakracore

CVE-2019-0609

A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2019-0639, CVE-2019-0680, CVE-2019-0769, CVE-2019-0770, CVE-2019-0771, CVE-2019-0773, CVE-2019-0783.

Vulnerability class: Buffer Overflow

Published 2019-04-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.098 (95.6th percentile), scored 2026-10-25.

Low probability of exploitation in the next 30 days, but still tracked. 96th percentile — 95.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.098 · newest: 0.098 · change: 0.000

Affected products

Microsoft Chakracore — versions Windows Server 2019
Microsoft Edge
Microsoft Internet Explorer — versions 11
Microsoft Internet Explorer 11 — versions Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1
Microsoft Edge — versions Windows RT 8.1, Windows 10 for 32-bit Systems, Windows 10 for x64-based Systems
Microsoft Windows 10 — versions 1607, 1703, 1709
Microsoft Windows 7
Microsoft Windows 8.1
Microsoft Windows Rt 8.1
Microsoft Windows Server 2008 — versions r2

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0609 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2019-0609?: CVE-2019-0609 is a high-severity vulnerability in Microsoft Chakracore, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2019-04-08.
How severe is CVE-2019-0609?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2019-0609 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.