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Vulnerability details: VCID-8h5s-cdt9-guh9
Vulnerability ID VCID-8h5s-cdt9-guh9
Aliases CVE-2025-4091
Summary Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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 < 138, Firefox ESR < 128.10, Thunderbird < 138, and Thunderbird ESR < 128.10.
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
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-4091.json
epss 0.00031 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00031 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00031 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00031 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00031 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00041 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00041 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00041 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00041 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00043 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00043 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00043 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00043 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00043 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00075 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
epss 0.00082 https://api.first.org/data/v1/epss?cve=CVE-2025-4091
cvssv3.1 6.5 https://bugzilla.mozilla.org/buglist.cgi?bug_id=1951161%2C1952105
ssvc Track https://bugzilla.mozilla.org/buglist.cgi?bug_id=1951161%2C1952105
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/mfsa2025-28
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-29
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-31
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-32
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-28/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-28/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-29/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-29/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-31/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-31/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-32/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-32/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-4091.json
https://api.first.org/data/v1/epss?cve=CVE-2025-4091
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-4091
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2362912 https://bugzilla.redhat.com/show_bug.cgi?id=2362912
buglist.cgi?bug_id=1951161%2C1952105 https://bugzilla.mozilla.org/buglist.cgi?bug_id=1951161%2C1952105
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:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
CVE-2025-4091 https://nvd.nist.gov/vuln/detail/CVE-2025-4091
mfsa2025-28 https://www.mozilla.org/en-US/security/advisories/mfsa2025-28
mfsa2025-28 https://www.mozilla.org/security/advisories/mfsa2025-28/
mfsa2025-29 https://www.mozilla.org/en-US/security/advisories/mfsa2025-29
mfsa2025-29 https://www.mozilla.org/security/advisories/mfsa2025-29/
mfsa2025-31 https://www.mozilla.org/en-US/security/advisories/mfsa2025-31
mfsa2025-31 https://www.mozilla.org/security/advisories/mfsa2025-31/
mfsa2025-32 https://www.mozilla.org/en-US/security/advisories/mfsa2025-32
mfsa2025-32 https://www.mozilla.org/security/advisories/mfsa2025-32/
RHSA-2025:4443 https://access.redhat.com/errata/RHSA-2025:4443
RHSA-2025:4458 https://access.redhat.com/errata/RHSA-2025:4458
RHSA-2025:4460 https://access.redhat.com/errata/RHSA-2025:4460
RHSA-2025:4751 https://access.redhat.com/errata/RHSA-2025:4751
RHSA-2025:4752 https://access.redhat.com/errata/RHSA-2025:4752
RHSA-2025:4753 https://access.redhat.com/errata/RHSA-2025:4753
RHSA-2025:4756 https://access.redhat.com/errata/RHSA-2025:4756
RHSA-2025:4797 https://access.redhat.com/errata/RHSA-2025:4797
RHSA-2025:7428 https://access.redhat.com/errata/RHSA-2025:7428
RHSA-2025:7506 https://access.redhat.com/errata/RHSA-2025:7506
RHSA-2025:7507 https://access.redhat.com/errata/RHSA-2025:7507
RHSA-2025:7543 https://access.redhat.com/errata/RHSA-2025:7543
RHSA-2025:7544 https://access.redhat.com/errata/RHSA-2025:7544
RHSA-2025:7545 https://access.redhat.com/errata/RHSA-2025:7545
RHSA-2025:7547 https://access.redhat.com/errata/RHSA-2025:7547
RHSA-2025:7689 https://access.redhat.com/errata/RHSA-2025:7689
RHSA-2025:7690 https://access.redhat.com/errata/RHSA-2025:7690
RHSA-2025:7691 https://access.redhat.com/errata/RHSA-2025:7691
RHSA-2025:7692 https://access.redhat.com/errata/RHSA-2025:7692
RHSA-2025:7693 https://access.redhat.com/errata/RHSA-2025:7693
RHSA-2025:7694 https://access.redhat.com/errata/RHSA-2025:7694
RHSA-2025:7695 https://access.redhat.com/errata/RHSA-2025:7695
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-2025-4091.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:L/I:L/A:N Found at https://bugzilla.mozilla.org/buglist.cgi?bug_id=1951161%2C1952105
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:T/P:M/B:A/M:M/D:T/2025-04-29T15:36:41Z/ Found at https://bugzilla.mozilla.org/buglist.cgi?bug_id=1951161%2C1952105
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:L/I:L/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-28/
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:T/P:M/B:A/M:M/D:T/2025-04-29T15:36:41Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-28/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-29/
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:T/P:M/B:A/M:M/D:T/2025-04-29T15:36:41Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-29/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-31/
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:T/P:M/B:A/M:M/D:T/2025-04-29T15:36:41Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-31/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-32/
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:T/P:M/B:A/M:M/D:T/2025-04-29T15:36:41Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-32/
Exploit Prediction Scoring System (EPSS)
Percentile 0.07228
EPSS Score 0.00031
Published At April 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-04-29T17:00:31.755439+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2025/4xxx/CVE-2025-4091.json 36.0.0