Exploited· due 2021-11-176.8mediumMedium
CVE-2021-34448
Microsoft Windows 10 1507
Scripting Engine Memory Corruption Vulnerability
Exploitation status
- CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
- US federal civilian agencies are required to remediate it by 2021-11-17. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.
- A vendor advisory or patch reference has been published.
Required action
Apply updates per vendor instructions.
CISA’s wording, unedited.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, exploitation depends on conditions outside the attacker's control.
- To exploit it, no account is needed.
- Beyond that, someone has to be persuaded to take an action first.
Scoring
- CVSS
- 6.8 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N- Weakness
- CWE-787
- Assigned by
- secure@microsoft.com
Dates
- Published
- 2021-07-16
- Last modified
- 2026-08-10
- Added to KEV
- 2021-11-03
- Remediation due
- 2021-11-17
- Sources
- CISA KEV, NVD
Affected products
- 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 7all versions
- Microsoft Windows 8.1all versions
- Microsoft Windows Rt 8.1all versions
- Microsoft Windows Server 2008r2
- Microsoft Windows Server 2012all versions, r2
As listed in the NVD configuration data. Not a statement about your estate.