Vulnerability Details : CVE-2021-26411
Used for ransomware!
Internet Explorer Memory Corruption Vulnerability
Vulnerability category: Memory Corruption
Products affected by CVE-2021-26411
- cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*
- cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:*
CVE-2021-26411 is in the CISA Known Exploited Vulnerabilities Catalog
This issue is known to have been leveraged as part of a ransomware campaign.
CISA vulnerability name:
Microsoft Internet Explorer Memory Corruption Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
Microsoft Internet Explorer contains an unspecified vulnerability that allows for memory corruption.
Notes:
https://nvd.nist.gov/vuln/detail/CVE-2021-26411
Added on
2021-11-03
Action due date
2021-11-17
Exploit prediction scoring system (EPSS) score for CVE-2021-26411
5.55%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 93 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-26411
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.1
|
MEDIUM | AV:N/AC:H/Au:N/C:P/I:P/A:P |
4.9
|
6.4
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.6
|
5.9
|
NIST | |
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST | 2024-07-25 |
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L |
2.8
|
5.3
|
Microsoft Corporation |
CWE ids for CVE-2021-26411
-
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.Assigned by: nvd@nist.gov (Primary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-26411
-
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26411
CVE-2021-26411 - Security Update Guide - Microsoft - Internet Explorer Memory Corruption VulnerabilityPatch;Vendor Advisory
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