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Vulnerability details: VCID-ccx5-zrys-yqgy
Vulnerability ID VCID-ccx5-zrys-yqgy
Aliases CVE-2021-4127
Summary An out of date graphics library (Angle) likely contained vulnerabilities that could potentially be exploited.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4127.json
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
epss 0.0024 https://api.first.org/data/v1/epss?cve=CVE-2021-4127
cvssv3.1 9.8 https://bugzilla.mozilla.org/show_bug.cgi?id=1691547
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1691547
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2021-4127
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-11
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2021-12
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2021-11/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2021-11/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2021-12/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2021-12/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4127.json
https://api.first.org/data/v1/epss?cve=CVE-2021-4127
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23981
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23982
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23984
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23987
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29950
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29955
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-4127
1942784 https://bugzilla.redhat.com/show_bug.cgi?id=1942784
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-2021-4127 https://nvd.nist.gov/vuln/detail/CVE-2021-4127
mfsa2021-11 https://www.mozilla.org/en-US/security/advisories/mfsa2021-11
mfsa2021-11 https://www.mozilla.org/security/advisories/mfsa2021-11/
mfsa2021-12 https://www.mozilla.org/en-US/security/advisories/mfsa2021-12
mfsa2021-12 https://www.mozilla.org/security/advisories/mfsa2021-12/
RHSA-2021:0989 https://access.redhat.com/errata/RHSA-2021:0989
RHSA-2021:0990 https://access.redhat.com/errata/RHSA-2021:0990
RHSA-2021:0991 https://access.redhat.com/errata/RHSA-2021:0991
RHSA-2021:0992 https://access.redhat.com/errata/RHSA-2021:0992
RHSA-2021:0993 https://access.redhat.com/errata/RHSA-2021:0993
RHSA-2021:0994 https://access.redhat.com/errata/RHSA-2021:0994
RHSA-2021:0995 https://access.redhat.com/errata/RHSA-2021:0995
RHSA-2021:0996 https://access.redhat.com/errata/RHSA-2021:0996
show_bug.cgi?id=1691547 https://bugzilla.mozilla.org/show_bug.cgi?id=1691547
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-4127.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:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1691547
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-16T15:35:14Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1691547
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2021-4127
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:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2021-11/
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-16T15:35:14Z/ Found at https://www.mozilla.org/security/advisories/mfsa2021-11/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.mozilla.org/security/advisories/mfsa2021-12/
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-16T15:35:14Z/ Found at https://www.mozilla.org/security/advisories/mfsa2021-12/
Exploit Prediction Scoring System (EPSS)
Percentile 0.47052
EPSS Score 0.0024
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:48.325859+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2021/mfsa2021-11.yml 37.0.0