Out-of-Bounds Write in Windows Scripting Engine (CVE-2021-26435)
Summary
Out-of-bounds write in Windows Scripting Engine (CVE-2021-26435). Confidential information can be exposed externally.
Original description
The description as published by the source.
Windows Scripting Engine Memory Corruption Vulnerability
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A weakness called CVE-2021-26435 was discovered in Windows Scripting Engine.
In plain terms, it is an out-of-bounds write that can let attackers hijack the program.
Severity is High (CVSS 8.1/10). If exploited, attackers can leak data or disrupt key functionality.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "Windows Scripting Engine CVE-2021-26435".
CVE-2021-26435 (Windows Scripting Engine). Severity: High / CVSSv3 8.1. Category: CWE-787.
Response plan:
- Check the vendor advisory for affected versions and the patched release.
- If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
- If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
- Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.
A weakness (CVE-2021-26435) in Windows Scripting Engine. In plain words, it is an out-of-bounds write that can let attackers hijack the program.
Target versions of Windows Scripting Engine (see vendor advisory). If running in production, identify exposure immediately.
Severity: High (CVSS 8.1/10). If exploited, attackers can leak data or disrupt key functionality.
Update to the patched release as listed in the vendor advisory. (Typical mitigation pattern for CWE-787)
If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.
Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.
References
- web msrc.microsoft.com
- web portal.msrc.microsoft.com
- web nvd.nist.gov
- web github.com