How severe is CVE-2025-11711?

CVE-2025-11711 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2025-11711 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-11711?

CVE-2025-11711 primarily affects Mozilla Firefox. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-11711?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-11711 have an EU (EUVD) identifier?

Yes. CVE-2025-11711 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34205.

When was CVE-2025-11711 published?

CVE-2025-11711 was published on 2025-10-14 and last updated on 2026-06-17.

CVE-2025-11711

CVE-2025-11711 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-591.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-34205
Weakness: CWE-591
Affected product: Mozilla Firefox
Published: 2025-10-14
Last modified: 2026-06-17

Description

There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

Frequently asked questions

What is CVE-2025-11711?: There was a way to change the value of JavaScript Object properties that were supposed to be non-writeable. This vulnerability was fixed in Firefox 144, Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
How severe is CVE-2025-11711?: CVE-2025-11711 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2025-11711 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-11711?: CVE-2025-11711 primarily affects Mozilla Firefox. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-11711?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-11711 have an EU (EUVD) identifier?: Yes. CVE-2025-11711 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-34205.
When was CVE-2025-11711 published?: CVE-2025-11711 was published on 2025-10-14 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

More vulnerabilities in Mozilla Firefox

CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4692 — Critical (CVSS 10.0): Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR…
CVE-2026-4689 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…

All CVEs affecting Mozilla Firefox →

Other CWE-591 vulnerabilities

CVE-2024-38131 — High (CVSS 8.8): Clipboard Virtual Channel Extension Remote Code Execution Vulnerability
CVE-2025-27482 — High (CVSS 8.1): Sensitive data storage in improperly locked memory in Remote Desktop Gateway Service allows an unauthorized attacker to…
CVE-2025-24045 — High (CVSS 8.1): Sensitive data storage in improperly locked memory in Windows Remote Desktop Services allows an unauthorized attacker…
CVE-2025-24035 — High (CVSS 8.1): Sensitive data storage in improperly locked memory in Windows Remote Desktop Services allows an unauthorized attacker…
CVE-2025-21309 — High (CVSS 8.1): Windows Remote Desktop Services Remote Code Execution Vulnerability
CVE-2025-21294 — High (CVSS 8.1): Microsoft Digest Authentication Remote Code Execution Vulnerability

Browse all CWE-591 vulnerabilities →