CVE-2025-8027

Description

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. This vulnerability affects Firefox < 141, Firefox ESR < 115.26, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Affected: Mozilla Firefox ESR
Affected: Mozilla Firefox ESR
Affected: Mozilla Firefox ESR
Affected: Mozilla Thunderbird
Affected: Mozilla Thunderbird
Affected: Mozilla Thunderbird
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1968423 permissions required
https://www.mozilla.org/security/advisories/mfsa2025-56/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-57/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-58/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-59/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-61/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-62/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-63/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-8027?
CVE-2025-8027 has been scored as a medium severity vulnerability.
How to fix CVE-2025-8027?
To fix CVE-2025-8027, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-8027 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-8027 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-8027?
CVE-2025-8027 affects Mozilla Firefox, Mozilla Firefox ESR, Mozilla Firefox ESR, Mozilla Firefox ESR, Mozilla Thunderbird, Mozilla Thunderbird, Mozilla Thunderbird.
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