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Vulnerability details: VCID-k2g8-b3u6-63aj
Vulnerability ID VCID-k2g8-b3u6-63aj
Aliases CVE-2025-8027
Summary On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-457 Use of Uninitialized Variable
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-8027.json
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2025-8027
cvssv3.1 6.5 https://bugzilla.mozilla.org/show_bug.cgi?id=1968423
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1968423
cvssv3.1 7.6 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-56
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-57
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-58
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-59
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-61
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-62
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-63
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-56/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-56/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-57/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-57/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-58/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-58/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-59/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-59/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-61/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-61/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-62/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-62/
cvssv3.1 6.5 https://www.mozilla.org/security/advisories/mfsa2025-63/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-63/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-8027.json
https://api.first.org/data/v1/epss?cve=CVE-2025-8027
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-8027
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2382707 https://bugzilla.redhat.com/show_bug.cgi?id=2382707
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-2025-8027 https://nvd.nist.gov/vuln/detail/CVE-2025-8027
mfsa2025-56 https://www.mozilla.org/en-US/security/advisories/mfsa2025-56
mfsa2025-56 https://www.mozilla.org/security/advisories/mfsa2025-56/
mfsa2025-57 https://www.mozilla.org/en-US/security/advisories/mfsa2025-57
mfsa2025-57 https://www.mozilla.org/security/advisories/mfsa2025-57/
mfsa2025-58 https://www.mozilla.org/en-US/security/advisories/mfsa2025-58
mfsa2025-58 https://www.mozilla.org/security/advisories/mfsa2025-58/
mfsa2025-59 https://www.mozilla.org/en-US/security/advisories/mfsa2025-59
mfsa2025-59 https://www.mozilla.org/security/advisories/mfsa2025-59/
mfsa2025-61 https://www.mozilla.org/en-US/security/advisories/mfsa2025-61
mfsa2025-61 https://www.mozilla.org/security/advisories/mfsa2025-61/
mfsa2025-62 https://www.mozilla.org/en-US/security/advisories/mfsa2025-62
mfsa2025-62 https://www.mozilla.org/security/advisories/mfsa2025-62/
mfsa2025-63 https://www.mozilla.org/en-US/security/advisories/mfsa2025-63
mfsa2025-63 https://www.mozilla.org/security/advisories/mfsa2025-63/
RHSA-2025:11747 https://access.redhat.com/errata/RHSA-2025:11747
RHSA-2025:11748 https://access.redhat.com/errata/RHSA-2025:11748
RHSA-2025:11797 https://access.redhat.com/errata/RHSA-2025:11797
RHSA-2025:12044 https://access.redhat.com/errata/RHSA-2025:12044
RHSA-2025:12045 https://access.redhat.com/errata/RHSA-2025:12045
RHSA-2025:12046 https://access.redhat.com/errata/RHSA-2025:12046
RHSA-2025:12187 https://access.redhat.com/errata/RHSA-2025:12187
RHSA-2025:12188 https://access.redhat.com/errata/RHSA-2025:12188
RHSA-2025:12278 https://access.redhat.com/errata/RHSA-2025:12278
RHSA-2025:12302 https://access.redhat.com/errata/RHSA-2025:12302
RHSA-2025:12353 https://access.redhat.com/errata/RHSA-2025:12353
RHSA-2025:12360 https://access.redhat.com/errata/RHSA-2025:12360
RHSA-2025:12361 https://access.redhat.com/errata/RHSA-2025:12361
RHSA-2025:13645 https://access.redhat.com/errata/RHSA-2025:13645
RHSA-2025:13646 https://access.redhat.com/errata/RHSA-2025:13646
RHSA-2025:13647 https://access.redhat.com/errata/RHSA-2025:13647
RHSA-2025:13648 https://access.redhat.com/errata/RHSA-2025:13648
RHSA-2025:13649 https://access.redhat.com/errata/RHSA-2025:13649
RHSA-2025:13650 https://access.redhat.com/errata/RHSA-2025:13650
RHSA-2025:13651 https://access.redhat.com/errata/RHSA-2025:13651
RHSA-2025:13676 https://access.redhat.com/errata/RHSA-2025:13676
show_bug.cgi?id=1968423 https://bugzilla.mozilla.org/show_bug.cgi?id=1968423
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-2025-8027.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:R/S:U/C:H/I:N/A:N Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1968423
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

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none

required

unchanged

changed

high

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none

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none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-07-23T13:42:23Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1968423
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L 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

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none

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low

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-56/
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/2025-07-23T13:42:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-56/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-57/
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/2025-07-23T13:42:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-57/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-58/
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/2025-07-23T13:42:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-58/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-59/
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/2025-07-23T13:42:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-59/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-61/
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/2025-07-23T13:42:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-61/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-62/
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/2025-07-23T13:42:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-62/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-63/
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/2025-07-23T13:42:23Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-63/
Exploit Prediction Scoring System (EPSS)
Percentile 0.10529
EPSS Score 0.00039
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:24.105886+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2025/mfsa2025-62.yml 37.0.0