CVE-2021-43221: microsoft edge_chromium Code Injection
CVSS: 4.2v3.1MediumModified
Published 24-11-2021Last modified 19-08-2026
Vulnerability summary
CVE-2021-43221 is a medium (CVSS 4.2) Code Injection vulnerability in microsoft edge_chromium. EPSS estimates a 1.15% chance of exploitation in the next 30 days, higher than 66.4% of scored vulnerabilities.
CVSS score
4.2/10
010
Medium · v3.1 (CVE.org)EPSS score
1.15%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 24-11-2021PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
Description
Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsMedium 4.2Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:CSourcesAll 2 agree
- NVDNIST4.2MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Medium 4.0Preferred score · NVD (NIST)
AV:N/AC:H/Au:N/C:P/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.15%
Chance of exploitation in the next 30 days
Percentile
66%
Versus all other CVEs
30-day change
+0.01 pp
From 1.14% on 20-09-2026
20-09-202620-10-2026
EPSS score1.15%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft2 products
- edge_chromium< 96.0.1054.29
- microsoft edge (chromium-based)≥ 1.0.0.0, < 96.0 1954.29
1 vendor · 2 products
References
2 links
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43221X Refsource MISCX TransferredPatchVendor Advisory