Search for vulnerabilities
Vulnerability details: VCID-11kx-sata-aaam
Vulnerability ID VCID-11kx-sata-aaam
Aliases CVE-2021-38501
Summary Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. 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. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
System Score Found at
generic_textual Medium http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-38501.html
rhas Important https://access.redhat.com/errata/RHSA-2021:3755
rhas Important https://access.redhat.com/errata/RHSA-2021:3756
rhas Important https://access.redhat.com/errata/RHSA-2021:3757
rhas Important https://access.redhat.com/errata/RHSA-2021:3791
rhas Important https://access.redhat.com/errata/RHSA-2021:3838
rhas Important https://access.redhat.com/errata/RHSA-2021:3839
rhas Important https://access.redhat.com/errata/RHSA-2021:3840
rhas Important https://access.redhat.com/errata/RHSA-2021:3841
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38501.json
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00295 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00334 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00335 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00465 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00465 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00465 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.00465 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
epss 0.01209 https://api.first.org/data/v1/epss?cve=CVE-2021-38501
rhbs high https://bugzilla.redhat.com/show_bug.cgi?id=2011101
generic_textual Medium https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38501
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 6.8 https://nvd.nist.gov/vuln/detail/CVE-2021-38501
cvssv3 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-38501
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2021-38501
archlinux High https://security.archlinux.org/AVG-2443
archlinux High https://security.archlinux.org/AVG-2459
generic_textual Medium https://ubuntu.com/security/notices/USN-5132-1
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-43
generic_textual Medium https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/#CVE-2021-38501
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-45
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-47
Reference id Reference type URL
http://people.canonical.com/~ubuntu-security/cve/2021/CVE-2021-38501.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38501.json
https://api.first.org/data/v1/epss?cve=CVE-2021-38501
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1685354%2C1715755%2C1723176
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38501
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://ubuntu.com/security/notices/USN-5132-1
https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/#CVE-2021-38501
https://www.mozilla.org/security/advisories/mfsa2021-43/
https://www.mozilla.org/security/advisories/mfsa2021-45/
https://www.mozilla.org/security/advisories/mfsa2021-47/
2011101 https://bugzilla.redhat.com/show_bug.cgi?id=2011101
AVG-2443 https://security.archlinux.org/AVG-2443
AVG-2459 https://security.archlinux.org/AVG-2459
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
CVE-2021-38501 https://nvd.nist.gov/vuln/detail/CVE-2021-38501
mfsa2021-43 https://www.mozilla.org/en-US/security/advisories/mfsa2021-43
mfsa2021-45 https://www.mozilla.org/en-US/security/advisories/mfsa2021-45
mfsa2021-47 https://www.mozilla.org/en-US/security/advisories/mfsa2021-47
RHSA-2021:3755 https://access.redhat.com/errata/RHSA-2021:3755
RHSA-2021:3756 https://access.redhat.com/errata/RHSA-2021:3756
RHSA-2021:3757 https://access.redhat.com/errata/RHSA-2021:3757
RHSA-2021:3791 https://access.redhat.com/errata/RHSA-2021:3791
RHSA-2021:3838 https://access.redhat.com/errata/RHSA-2021:3838
RHSA-2021:3839 https://access.redhat.com/errata/RHSA-2021:3839
RHSA-2021:3840 https://access.redhat.com/errata/RHSA-2021:3840
RHSA-2021:3841 https://access.redhat.com/errata/RHSA-2021:3841
USN-5107-1 https://usn.ubuntu.com/5107-1/
USN-5132-1 https://usn.ubuntu.com/5132-1/
USN-5248-1 https://usn.ubuntu.com/5248-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-38501.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38501
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38501
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-38501
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.49904
EPSS Score 0.00295
Published At March 28, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
There are no relevant records.