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Vulnerability details: VCID-2ntx-ygm4-1bgn
Vulnerability ID VCID-2ntx-ygm4-1bgn
Aliases CVE-2025-4921
Summary An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.00017 https://api.first.org/data/v1/epss?cve=CVE-2025-4921
cvssv3.1 8.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2025-36
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2025-37
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2025-4921
https://bugzilla.mozilla.org/show_bug.cgi?id=1966614
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-4921
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2025-36/
https://www.mozilla.org/security/advisories/mfsa2025-37/
CVE-2025-4921 https://nvd.nist.gov/vuln/detail/CVE-2025-4921
mfsa2025-36 https://www.mozilla.org/en-US/security/advisories/mfsa2025-36
mfsa2025-37 https://www.mozilla.org/en-US/security/advisories/mfsa2025-37
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://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
Exploit Prediction Scoring System (EPSS)
Percentile 0.02539
EPSS Score 0.00017
Published At May 18, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-05-18T13:19:08.582282+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2025/mfsa2025-37.yml 36.0.0