CVE-2021-34480

Name: CVE-2021-34480
Creator: NVD / NIST
Published: 2021-08-12T18:15:09.04+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 31.82%

Last modified Jun 17, 2026

CVE-2021-34480 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. Scripting Engine Memory Corruption Vulnerability. EPSS estimates a 31.82% chance of exploitation in the next 30 days.

Description

Scripting Engine Memory Corruption Vulnerability

Metrics

CVSS 3.1

6.8/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS Probability

31.82%

98.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 10	All versions	—
Microsoft	Windows 10	20h2	—
Microsoft	Windows 10	21h1	—
Microsoft	Windows 10	1607	—
Microsoft	Windows 10	1809	—
Microsoft	Windows 10	1909	—
Microsoft	Windows 10	2004	—
Microsoft	Windows 7	All versions	Sp1
Microsoft	Windows 8.1	All versions	—
Microsoft	Windows Rt 8.1	All versions	—
Microsoft	Windows Server 2008	r2	Sp1
Microsoft	Windows Server 2012	All versions	—
Microsoft	Windows Server 2012	r2	—
Microsoft	Windows Server 2016	All versions	—
Microsoft	Windows Server 2019	All versions	—

References

http://packetstormsecurity.com/files/164121/Internet-Explorer-JIT-Optimization-Memory-Corruption.htmlThird Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34480Patch, Vendor Advisory
http://packetstormsecurity.com/files/164121/Internet-Explorer-JIT-Optimization-Memory-Corruption.htmlThird Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34480Patch, Vendor Advisory

Timeline

Published: Aug 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34480?

Scripting Engine Memory Corruption Vulnerability

How severe is CVE-2021-34480?

CVE-2021-34480 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 31.82% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34480?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34480?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST