CVE-2025-1937

HIGH

7.5

CVSS v3

Description

Memory safety bugs present in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR 128.7, and Thunderbird 128.7. 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 was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

CWE-1260

How to fix

Remediation Available

firefoxDebian

Fixed in:136.0-1CVE-2025-1937

firefoxRocky

Fixed in:0:128.8.0-1.el7_9RHSA-2025:2699

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_2RHSA-2025:2708

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_4RHSA-2025:2484

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_4RHSA-2025:2484

Fixed in:0:128.8.0-1.el8_2RHSA-2025:2708

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

firefoxRed Hat / RHEL

Fixed in:0:128.8.0-1.el7_9RHSA-2025:2699

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_4RHSA-2025:2484

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_2RHSA-2025:2708

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_2RHSA-2025:2708

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

firefox-debuginfoRocky

Fixed in:0:128.8.0-1.el7_9RHSA-2025:2699

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_4RHSA-2025:2484

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_2RHSA-2025:2708

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

firefox-debuginfoRed Hat / RHEL

Fixed in:0:128.8.0-1.el7_9RHSA-2025:2699

Fixed in:0:128.8.0-1.el8_4RHSA-2025:2484

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_2RHSA-2025:2708

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

firefox-debugsourceRocky

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_4RHSA-2025:2484

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_2RHSA-2025:2708

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

firefox-debugsourceRed Hat / RHEL

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_8RHSA-2025:2486

Fixed in:0:128.8.0-1.el8_4RHSA-2025:2484

Fixed in:0:128.8.0-1.el8_6RHSA-2025:2485

Fixed in:0:128.8.0-1.el8_10RHSA-2025:2452

Fixed in:0:128.8.0-1.el8_2RHSA-2025:2708

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_0RHSA-2025:2481

firefox-x11Red Hat / RHEL

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

firefox-x11Rocky

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_4RHSA-2025:2479

Fixed in:0:128.8.0-1.el9_2RHSA-2025:2480

Fixed in:0:128.8.0-1.el9_5RHSA-2025:2359

thunderbirdRocky

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_2RHSA-2025:2960

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

thunderbirdRed Hat / RHEL

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_2RHSA-2025:2960

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

thunderbird-debuginfoRed Hat / RHEL

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_2RHSA-2025:2960

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

thunderbird-debuginfoRocky

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_2RHSA-2025:2960

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

thunderbird-debugsourceRed Hat / RHEL

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_2RHSA-2025:2960

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

thunderbird-debugsourceRocky

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_10RHSA-2025:2900

Fixed in:0:128.8.0-2.el8_4RHSA-2025:3009

Fixed in:0:128.8.0-2.el8_8RHSA-2025:2958

Fixed in:0:128.8.0-2.el8_6RHSA-2025:3036

Fixed in:0:128.8.0-2.el8_2RHSA-2025:2960

Fixed in:0:128.8.0-2.el9_5RHSA-2025:2899

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

Fixed in:0:128.8.0-2.el9_0RHSA-2025:3013

Fixed in:0:128.8.0-2.el9_4RHSA-2025:2957

Fixed in:0:128.8.0-2.el9_2RHSA-2025:2959

firefoxUbuntu

Fixed in:136.0+build3-0ubuntu0.20.04.1USN-7334-1

thunderbirdUbuntu

Fixed in:1:128.12.0+build1-0ubuntu0.22.04.1USN-7663-1

DeveloperEditionWindows application

Affected:115.21.0Fixed in:115.21.0Mozilla

Affected:135.0Fixed in:135.0Mozilla

Affected:128.8.0Fixed in:128.8.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:128.8.0Fixed in:128.8.0Mozilla

Affected:115.21.0Fixed in:115.21.0Mozilla

Affected:135.0Fixed in:135.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:129.0 136.0Fixed in:136.0Mozilla

Affected:128.8.0Fixed in:128.8.0Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

0.54%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

Vendor Advisory6

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-1260 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-1164	High	7.8	0.9%	-	-
CVE-2024-4778	Critical	9.8	0.4%	-	Fix
CVE-2019-25570	Medium	5.5	0.2%	-	-
CVE-2022-27813	High	8.1	0.2%	-	-
CVE-2019-25585	Medium	6.2	0.2%	-	-
CVE-2019-25559	Medium	5.5	0.2%	-	-

Common questions

How do I fix CVE-2025-1937?

Published advisories record a fix for 20 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2025-1937 being actively exploited?

Not that we know of. CVE-2025-1937 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.54% is the estimated probability that it will be exploited in the next 30 days. That is higher than 43% of all scored CVEs.

How severe is CVE-2025-1937?

CVE-2025-1937 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-1937 affect?

Published advisories record a fix for firefox (Debian), firefox (Rocky), firefox (Red Hat / RHEL), firefox-debuginfo (Rocky), and 16 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-13.