CVE-2021-32804: Arbitrary File Creation/Overwrite due to insufficient absolute path sanitization

highCVSS 8.2CVE-2021-32804

CSIRTS triage

Path traversal

What: Insufficient absolute path sanitization allows arbitrary file creation or overwrite.
Who is affected: Systems and applications using the affected code without proper path validation.
Urgency: High severity (CVSS 8.2); not currently exploited but path traversal vulnerabilities enable privilege escalation and data destruction.
Action: Identify the affected product and apply available security patch or implement strict path validation controls.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.2
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-32804

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Elevated exploitation riskCVE-2021-3280415.0% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 96% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2021-32804	coverage & exploitation status	NVD · CVE.org

Recent advisories for Arbitrary File Creation/Overwrite

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2021-32803: Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache p…msrc · 2026-08-06
highCVE-2021-37701: Arbitrary File Creation/Overwrite via insufficient symlink protection due to directory cache p…msrc · 2026-08-06