Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-cede-kbgf-8bgd
Vulnerability ID VCID-cede-kbgf-8bgd
Aliases CVE-2021-38494
Summary Mozilla developers Christian Holler and Lars T Hansen reported memory safety bugs present in Firefox 91. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
epss 0.0042 https://api.first.org/data/v1/epss?cve=CVE-2021-38494
archlinux High https://security.archlinux.org/AVG-2350
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-38
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-38494
ASA-202109-2 https://security.archlinux.org/ASA-202109-2
AVG-2350 https://security.archlinux.org/AVG-2350
mfsa2021-38 https://www.mozilla.org/en-US/security/advisories/mfsa2021-38
USN-5074-1 https://usn.ubuntu.com/5074-1/
No exploits are available.
Exploit Prediction Scoring System (EPSS)
Percentile 0.61816
EPSS Score 0.0042
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:17:10.951319+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-38.yml 38.0.0