CVE-2025-23109 | Address bar spoofing on iOS using long hostnames

Long hostnames in URLs could be leveraged to obscure the actual host of the website or spoof the website address. This vulnerability was fixed in Firefox for iOS 134.

Published: 2025-01-11 Last update: 2026-04-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-23109 is rated Moderate Risk (53.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.14%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-23109

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-21 0.88% 1.14% +0.25%
2 2026-04-12 0.65% 0.88% +0.23%
3 2026-03-04 — 0.65% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-23109

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-23109

OS Trackers for CVE-2025-23109

vendor priority summary link
alpine — CVE-2025-23109: 1 source package rows (firefox); 129 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 129. https://security.alpinelinux.org/vuln/CVE-2025-23109
debian unimportant CVE-2025-23109 unimportant priority: Debian including 1 source packages (firefox), 1 status rows across 1 suites (sid): resolved 1. https://security-tracker.debian.org/tracker/CVE-2025-23109
ubuntu medium CVE-2025-23109 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 10 status rows across 5 suites (focal, jammy, noble, oracular, upstream): not-affected 6, DNE 2, needs-triage 2. https://ubuntu.com/security/CVE-2025-23109

Affected software / configurations for CVE-2025-23109

Vendor Product Version Raw CPE
mozilla firefox < 134.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:*

References for CVE-2025-23109

cvelogic Threat Intelligence