CVE-2021-26419Internet Explorer Out-of-Bounds Write
Scripting Engine Memory Corruption Vulnerability
Published Sep 15, 2021 · Updated Aug 3, 2024
Key Facts
Patch in the next maintenance window- CVE-2021-26419 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Internet Explorer (Microsoft).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 23% probability of exploitation in the next 30 days.
- Fixed versions are available, including Internet Explorer 10.0.10240.18931, Internet Explorer 10.0.14393.4401, Internet Explorer 10.0.17134.2207.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
23%
Higher than 97.7% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
40/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryhttps://blog.talosintelligence.com/2021/09/microsoft-patch-tuesday-for-sept-2021.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+feedburner%2FTalos+%28Talos%E2%84%A2+Blog%29
- advisoryhttps://isc.sans.edu/diary/rss/27834
- advisoryhttps://securityboulevard.com/2021/09/september-2021-patch-tuesday-comes-with-fixes-for-86-vulnerabilities-including-two-zero-days/
- advisoryhttps://us-cert.cisa.gov/
- advisoryhttps://us-cert.cisa.gov/ncas/current-activity/2021/09/14/microsoft-releases-september-2021-security-updates
- advisoryhttps://www.globalsecuritymag.com/Mindware-and-Quest-Sign,20210914,115985.html
Description
Scripting Engine Memory Corruption Vulnerability
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Internet ExplorerMicrosoft | 11, 9 | 10.0.14393.4401 |
Patched Releases
Internet Explorer
10.0.10240.18931, 10.0.14393.4401, 10.0.17134.2207, 10.0.17763.1935, 10.0.18363.1556, 10.0.19041.982, 6.0, 6.0.6003.21117, 6.1, 6.1.7601.24597, 6.2, 6.2.9200.23347, 6.3.9600.20016, 6.3.9600.20017
Timeline
Publicly disclosed
Sep 15, 2021
Last updated
Aug 3, 2024
Weakness Type
- CWE-787 Out-of-bounds Write
References
- advisoryblog.talosintelligence.com · microsoft-patch-tuesday-for-sept-2021.html
- advisoryisc.sans.edu · 27834
- advisorysecurityboulevard.com · september-2021-patch-tuesday-comes-with-fixes-f…
- advisoryus-cert.cisa.gov
- advisoryus-cert.cisa.gov · microsoft-releases-september-2021-security-upda…
FAQ
Common Questions.
Scripting Engine Memory Corruption Vulnerability
Affected: Internet Explorer (Microsoft) versions 11, 9. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Internet Explorer 10.0.10240.18931, Internet Explorer 10.0.14393.4401, Internet Explorer 10.0.17134.2207.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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