CVE-2025-5020 | Links using non-HTTP schemes opened from other apps such as Safari could have allowed spoofing of website addresses

Opening maliciously-crafted URLs in Firefox from other apps such as Safari could have allowed attackers to spoof website addresses if the URLs utilized non-HTTP schemes used internally by the Firefox iOS client. This vulnerability was fixed in Firefox for iOS 139.

Published: 2025-05-21 Last update: 2026-04-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-5020 is rated Low Risk (31.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.18%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2025-5020

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 2026-03-17 0.05% 0.18% +0.13%
2 2026-03-07 0.03% 0.05% +0.02%
3 2025-11-21 — 0.03% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-5020

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/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:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-5020

OS Trackers for CVE-2025-5020

vendor priority summary link
alpine — CVE-2025-5020: 1 source package rows (firefox); 145 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 145. https://security.alpinelinux.org/vuln/CVE-2025-5020
debian unimportant CVE-2025-5020 unimportant priority: Debian including 1 source packages (firefox), 1 status rows across 1 suites (sid): resolved 1. https://security-tracker.debian.org/tracker/CVE-2025-5020
ubuntu medium CVE-2025-5020 medium priority: Ubuntu including 2 source packages (firefox, thunderbird), 12 status rows across 6 suites (focal, jammy, noble, oracular, plucky, upstream): not-affected 8, DNE 2, needs-triage 2. https://ubuntu.com/security/CVE-2025-5020

Affected software / configurations for CVE-2025-5020

Vendor Product Version Raw CPE
mozilla firefox < 139.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:*

References for CVE-2025-5020

cvelogic Threat Intelligence