Is CVE-2021-26411 actively exploited?

Yes. CVE-2021-26411 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-26411 be exploited remotely?

The attack vector of CVE-2021-26411 has not been classified yet.

What is the CVSS score of CVE-2021-26411?

CVE-2021-26411 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-26411

HIGHCISA KEVIN THE WILD

CVE-2021-26411

Published: November 3, 2021

EPSS:92.47%probability of exploitation in 30 daysPercentile:99.7th

Official Description

Microsoft Internet Explorer contains an unspecified vulnerability that allows for memory corruption.

NVD Source

CISA KEV Advisory

Microsoft Internet Explorer Memory Corruption Vulnerability

Microsoft Internet Explorer contains an unspecified vulnerability that allows for memory corruption.

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This vulnerability in Microsoft Internet Explorer involves memory corruption, which can lead to various security issues, including arbitrary code execution. The very high EPSS score of 0.92473 suggests a strong probability of exploitation. Its inclusion in the KEV catalog confirms it has been actively exploited.

This vulnerability is actively exploited in the wild and is part of CISA's Known Exploited Vulnerabilities catalog. This means attackers are currently leveraging this flaw.

Recommended Action

Users should transition away from Internet Explorer to modern, supported browsers. Apply all available security updates from Microsoft to mitigate this and other vulnerabilities.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-26411 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-26411 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.