CVE-2025-8028
Mozilla Firefox vulnerability
- Published22 Jul 2025
Description
On arm64, a WASM `br_table` instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrect computation of the branch address. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
- https://www.mozilla.org/security/advisories/mfsa2025-56/
- https://www.mozilla.org/security/advisories/mfsa2025-57/
- https://www.mozilla.org/security/advisories/mfsa2025-58/
- https://www.mozilla.org/security/advisories/mfsa2025-59/
- https://www.mozilla.org/security/advisories/mfsa2025-61/
- https://www.mozilla.org/security/advisories/mfsa2025-62/
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1971581
- https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html
- https://www.mozilla.org/security/advisories/mfsa2025-56/
- https://www.mozilla.org/security/advisories/mfsa2025-57/
- https://www.mozilla.org/security/advisories/mfsa2025-58/
- https://www.mozilla.org/security/advisories/mfsa2025-59/
- https://www.mozilla.org/security/advisories/mfsa2025-61/
- https://www.mozilla.org/security/advisories/mfsa2025-62/
- https://www.mozilla.org/security/advisories/mfsa2025-63/
Frequently asked
Is CVE-2025-8028 being actively exploited?
CVE-2025-8028 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.51%.
How severe is CVE-2025-8028?
CVE-2025-8028 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.51% probability of exploitation.
Which products are affected by CVE-2025-8028?
Affected products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2025-8028?
Upgrade affected software to a fixed version, for example Mozilla Firefox 141.0, Mozilla Thunderbird 141.0 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2025-8028 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.