Actively exploited · Published Jul 16, 2021 · Assigned by microsoft
CVE-2021-34448Scripting Engine Memory Corruption Vulnerability
Medium 6.8 Exploited
In plain English
A medium-severity out-of-bounds write in Windows 10 Version 1507 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). The chance it is exploited in the next 30 days is estimated at 40.1% (higher than 99% of all known vulnerabilities). Apply updates per vendor instructions.
Severity (CVSS 3.1)6.8Medium
Exploit odds (30 days)40.1%top 1.4% of all CVEs
Exploited in the wildYesCISA KEV since Nov 3, 2021
Attack toolingNoneno public tooling known
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Nov 17, 2021.
Official description
Scripting Engine Memory Corruption Vulnerability
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1507 | 10.0.10240.0 – before 10.0.10240.19003 |
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 – before 10.0.14393.4530 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – before 10.0.17763.2061 |
| Microsoft | Windows 10 Version 1809 | 10.0.0 – before 10.0.17763.2061 |
| Microsoft | Windows 10 Version 1909 | 10.0.0 – before 10.0.18363.1679 |
| Microsoft | Windows 10 Version 2004 | 10.0.0 – before 10.0.19041.1110 |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 – before 10.0.19042.1110 |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 – before 10.0.19043.1110 |
| Microsoft | Windows 7 | 6.1.0 – before 6.1.7601.25661 |
| Microsoft | Windows 7 Service Pack 1 | 6.1.0 – before 6.1.7601.25661 |
| Microsoft | Windows 8.1 | 6.3.0 – before 6.3.9600.20069 |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | 6.1.7601.0 – before 6.1.7601.25661 |
| Microsoft | Windows Server 2012 | 6.2.9200.0 – before 6.2.9200.23409 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 – before 6.3.9600.20069 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – before 10.0.14393.4530 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – before 10.0.17763.2061 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C
References
- Scripting Engine Memory Corruption Vulnerability vendor-advisory, patch
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34448 x_refsource_MISC, x_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-34448 government-resource