CVE-2025-4091Patch(mozilla / firefox)

LOWCVSS 8.1 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch mozilla firefox systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. 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 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.

mozilla CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

Other references

Weakness type (CWE)

CWE-119

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

firefox
thunderbird

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Affected systems

Vendors

mozilla

Products

firefoxthunderbird

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Full discourse1 post

Giuseppe Paternicola@giuseppe_1337178d
Patch
🚨 HIGH: CVE-2025-4091 (CVSS 8.1) - Memory safety bugs in Firefox 137, Thunderbird 137, Firefox ESR 128.9 & Thunderbird 128.9 could enable arbitrary code execution. Update to Firefox 138/ESR 128.10 & Thunderbird 138/128.10 immediately. #CVE #PatchNow https://t.co/CnbTVj2Hbo
Post summary
The tweet alerts users to CVE-2025-4091, a high‑severity memory safety bug in Firefox and Thunderbird, and advises updating to the patched versions 138/128.10.
00000167
25 followersView on X

CPE platform detail4 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

4 of 4 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mozilla	firefox	-	-	-
App	mozilla	firefox	-	-	-
App	mozilla	thunderbird	-	-	-
App	mozilla	thunderbird	-	-	-

Explore more

Back to dashboard mozilla CVEs firefox vulnerabilities