How severe is CVE-2025-9183?

CVE-2025-9183 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-2025-9183 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-9183?

CVE-2025-9183 primarily affects Mozilla Firefox. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-9183?

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

Does CVE-2025-9183 have an EU (EUVD) identifier?

Yes. CVE-2025-9183 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25240.

When was CVE-2025-9183 published?

CVE-2025-9183 was published on 2025-08-19 and last updated on 2026-06-17.

CVE-2025-9183

CVE-2025-9183 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-451.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25240
Weakness: CWE-451
Affected product: Mozilla Firefox
Published: 2025-08-19
Last modified: 2026-06-17

Description

Spoofing issue in the Address Bar component. This vulnerability was fixed in Firefox 142 and Firefox ESR 140.2.

Frequently asked questions

What is CVE-2025-9183?: Spoofing issue in the Address Bar component. This vulnerability was fixed in Firefox 142 and Firefox ESR 140.2.
How severe is CVE-2025-9183?: CVE-2025-9183 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-2025-9183 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-9183?: CVE-2025-9183 primarily affects Mozilla Firefox. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-9183?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-9183 have an EU (EUVD) identifier?: Yes. CVE-2025-9183 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25240.
When was CVE-2025-9183 published?: CVE-2025-9183 was published on 2025-08-19 and last updated on 2026-06-17.

References

Affected products (2)

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

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-451 vulnerabilities

CVE-2026-2634 — Critical (CVSS 9.8): Malicious scripts could cause desynchronization between the address bar and web content before a response is received…
CVE-2026-0907 — Critical (CVSS 9.8): Incorrect security UI in Split View in Google Chrome prior to 144.0.7559.59 allowed a remote attacker to perform UI…
CVE-2026-0906 — Critical (CVSS 9.8): Incorrect security UI in Google Chrome on Android prior to 144.0.7559.59 allowed a remote attacker to spoof the…
CVE-2025-8043 — Critical (CVSS 9.8): Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in…
CVE-2026-11175 — High (CVSS 8.8): Incorrect security UI in Messages in Google Chrome on Android prior to 149.0.7827.53 allowed a remote attacker to…
CVE-2026-11172 — High (CVSS 8.8): Incorrect security UI in Contact Picker in Google Chrome on Android prior to 149.0.7827.53 allowed a remote attacker to…

Browse all CWE-451 vulnerabilities →