CVE-2025-1943

Description

Memory safety bugs present in Firefox 135 and Thunderbird 135. 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 < 136 and Thunderbird < 136.

Category

8.2
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.09%
Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Affected: Mozilla Thunderbird
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1869650%2C1938451%2C1940326%2C1944052%2C1944063%2C1947281 broken link
https://www.mozilla.org/security/advisories/mfsa2025-14/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-17/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-1943?
CVE-2025-1943 has been scored as a high severity vulnerability.
How to fix CVE-2025-1943?
To fix CVE-2025-1943, 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-2025-1943 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-1943 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-2025-1943?
CVE-2025-1943 affects Mozilla Firefox, Mozilla Thunderbird.
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