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CVE-20XX-?

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CVE-2021-34448

6.8 MEDIUM 40% exploit odds exploited in the wild Fix listed Memory safety OS & kernel

What it is

Scripting Engine Memory Corruption Vulnerability

At a glance

Exploitability: Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure, data tampering.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-06-09 00:00 UTC ReservedThe CVE id was reserved by its CNA
2021-07-16 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2021-11-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2021-11-17 Remediation deadlineCISA's due date for federal agencies to fix it
2026-08-10 19:58 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 40.1% in the next 30 days (EPSS).
Severity: 6.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-07-16 21:15 UTC
Last modified: 2026-08-10 19:58 UTC
Added to CISA KEV: 2021-11-03
Exploit probability: 40.1% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Analyzed

Affected

Microsoft Windows 10 1507 < 10.0.10240.19003
Microsoft Windows 10 1607 < 10.0.14393.4530
Microsoft Windows 10 1809 < 10.0.17763.2061
Microsoft Windows 10 1909 < 10.0.18363.1679
Microsoft Windows 10 2004 < 10.0.19041.1110
Microsoft Windows 10 20h2 < 10.0.19042.1110
Microsoft Windows 10 21h1 < 10.0.19043.1110
Microsoft Windows 7

Attack profile CVSS 3.1 · 6.8

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-34448.md and follow it. Check whether this project is affected by CVE-2021-34448. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record