CVE-2021-26411
Exploited in the Wild
✓ Confirmed 0-Day
★ Google Project Zero
Triaged: March 5, 2026
4 articles
EPSS Score
Source: FIRST.org · 2026-05-24
92.47%
probability
This CVE has a 92.47% probability
of being exploited in the next 30 days.
0%
Top 99.7th percentile of all CVEs
100%
CVSS score unavailable
Neither CIRCL nor NVD returned a CVSS score for this CVE.
View on VulnerabilityLookup ↗
Description
Project ZeroUse-after-free in MSHTML
Attack Intelligence
CWE-118
· Incorrect Access of Indexable Resource ('Range Error')
CWE-119
· Buffer Overflow
CWE-416
· Use After Free
CWE-664
· Improper Control of a Resource Through its Lifetime
CWE-666
· Operation on Resource in Wrong Phase of Lifetime
CWE-672
· Operation on a Resource after Expiration or Release
CWE-825
· Expired Pointer Dereference
Google Project Zero
Patched
March 9, 2021
Reported by
yangkang(@dnpushme) & huangyi(@C0rk1_H) & Enki
Root Cause Analysis
https://googleprojectzero.github.io/0days-in-the-wild/0day-RCAs/2021/CVE-2021-26411.html
Microsoft March 2021 Patch Tuesday fixes 82 flaws, 2 zero-days
BleepingComputer
Mar 09, 2021
Google Warns of Internet Explorer Zero-Day Vulnerability Exploited by ScarCruft Hackers
TheHackerNews
March 2021 Patch Tuesday – 82 Vulnerabilities, 10 Critical, Adobe
Qualys
Mar 09, 2021
Qualys Response to CISA Alert: Binding Operational Directive 22-01
Qualys
Nov 09, 2021
Signal Intelligence
Confidence
95%
EPSS
92.47%
Mentions
4
Last Seen
Nov 09, 2021
CNA Information
Analyst Note
Auto-imported from Google Project Zero — confirmed zero-day by definition.
Triage Info
Decided atMar 05, 2026