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Vulnerability details: VCID-gf4f-pq9k-kugc
Vulnerability ID VCID-gf4f-pq9k-kugc
Aliases CVE-2025-6424
Summary A use-after-free in FontFaceSet resulted in a potentially exploitable crash.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-6424.json
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2025-6424
cvssv3.1 9.8 https://bugzilla.mozilla.org/show_bug.cgi?id=1966423
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1966423
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-51
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-52
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-53
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-54
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-55
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2025-51/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-51/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2025-52/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-52/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2025-53/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-53/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2025-54/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-54/
cvssv3.1 9.8 https://www.mozilla.org/security/advisories/mfsa2025-55/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-55/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-6424.json
https://api.first.org/data/v1/epss?cve=CVE-2025-6424
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-6424
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2374559 https://bugzilla.redhat.com/show_bug.cgi?id=2374559
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:*:*:*
CVE-2025-6424 https://nvd.nist.gov/vuln/detail/CVE-2025-6424
mfsa2025-51 https://www.mozilla.org/en-US/security/advisories/mfsa2025-51
mfsa2025-51 https://www.mozilla.org/security/advisories/mfsa2025-51/
mfsa2025-52 https://www.mozilla.org/en-US/security/advisories/mfsa2025-52
mfsa2025-52 https://www.mozilla.org/security/advisories/mfsa2025-52/
mfsa2025-53 https://www.mozilla.org/en-US/security/advisories/mfsa2025-53
mfsa2025-53 https://www.mozilla.org/security/advisories/mfsa2025-53/
mfsa2025-54 https://www.mozilla.org/en-US/security/advisories/mfsa2025-54
mfsa2025-54 https://www.mozilla.org/security/advisories/mfsa2025-54/
mfsa2025-55 https://www.mozilla.org/en-US/security/advisories/mfsa2025-55
mfsa2025-55 https://www.mozilla.org/security/advisories/mfsa2025-55/
RHSA-2025:10072 https://access.redhat.com/errata/RHSA-2025:10072
RHSA-2025:10073 https://access.redhat.com/errata/RHSA-2025:10073
RHSA-2025:10074 https://access.redhat.com/errata/RHSA-2025:10074
RHSA-2025:10159 https://access.redhat.com/errata/RHSA-2025:10159
RHSA-2025:10160 https://access.redhat.com/errata/RHSA-2025:10160
RHSA-2025:10161 https://access.redhat.com/errata/RHSA-2025:10161
RHSA-2025:10163 https://access.redhat.com/errata/RHSA-2025:10163
RHSA-2025:10164 https://access.redhat.com/errata/RHSA-2025:10164
RHSA-2025:10165 https://access.redhat.com/errata/RHSA-2025:10165
RHSA-2025:10166 https://access.redhat.com/errata/RHSA-2025:10166
RHSA-2025:10181 https://access.redhat.com/errata/RHSA-2025:10181
RHSA-2025:10182 https://access.redhat.com/errata/RHSA-2025:10182
RHSA-2025:10183 https://access.redhat.com/errata/RHSA-2025:10183
RHSA-2025:10184 https://access.redhat.com/errata/RHSA-2025:10184
RHSA-2025:10185 https://access.redhat.com/errata/RHSA-2025:10185
RHSA-2025:10186 https://access.redhat.com/errata/RHSA-2025:10186
RHSA-2025:10187 https://access.redhat.com/errata/RHSA-2025:10187
RHSA-2025:10188 https://access.redhat.com/errata/RHSA-2025:10188
RHSA-2025:10195 https://access.redhat.com/errata/RHSA-2025:10195
RHSA-2025:10196 https://access.redhat.com/errata/RHSA-2025:10196
RHSA-2025:10246 https://access.redhat.com/errata/RHSA-2025:10246
show_bug.cgi?id=1966423 https://bugzilla.mozilla.org/show_bug.cgi?id=1966423
USN-7663-1 https://usn.ubuntu.com/7663-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-6424.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=1966423
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:Y/T:T/P:M/B:A/M:M/D:T/2025-06-25T12:36:06Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1966423
Vector: CVSS:3.1/AV:N/AC:L/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: 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/mfsa2025-51/
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:Y/T:T/P:M/B:A/M:M/D:T/2025-06-25T12:36:06Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-51/
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/mfsa2025-52/
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:Y/T:T/P:M/B:A/M:M/D:T/2025-06-25T12:36:06Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-52/
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/mfsa2025-53/
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:Y/T:T/P:M/B:A/M:M/D:T/2025-06-25T12:36:06Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-53/
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/mfsa2025-54/
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:Y/T:T/P:M/B:A/M:M/D:T/2025-06-25T12:36:06Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-54/
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/mfsa2025-55/
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:Y/T:T/P:M/B:A/M:M/D:T/2025-06-25T12:36:06Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-55/
Exploit Prediction Scoring System (EPSS)
Percentile 0.28578
EPSS Score 0.001
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:22.935778+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2025/mfsa2025-55.yml 37.0.0