Security readout for executives and security teams
Plain-English summary
CVE-2025-23109 lets a malicious site use an overly long hostname to make Firefox for iOS show a misleading address. This can support phishing by hiding the real destination from the user. Mozilla says the issue was fixed in Firefox for iOS 134.
Executive priority
Treat as a routine but time-sensitive mobile browser update. The main business concern is phishing risk against users, not direct system compromise. Prioritize managed mobile fleets and high-risk users.
Technical view
The issue is an address bar spoofing weakness in Firefox for iOS involving long hostnames. It is classified as CWE-346 and scored CVSS 6.5, requiring user interaction over the network. Impact is integrity-focused because the displayed origin can be misleading.
Likely exposure
Exposure is limited to users running affected Firefox for iOS versions before the Mozilla fix in version 134. Organizations with managed iPhones or iPads should check installed Firefox for iOS versions and update status.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. Practical risk is phishing or social engineering where a user is convinced to open a crafted URL and trusts the spoofed address bar.
Researcher notes
Evidence is limited to Mozilla/CVE descriptions. The vulnerability concerns UI trust and hostname display, not code execution. Do not infer broader Firefox platforms unless vendor sources state them. No public exploitation confirmation is provided in the bundle.
Mitigation direction
- Update Firefox for iOS to version 134 or later.
- Use mobile device management to confirm Firefox for iOS update compliance.
- Warn users not to trust long or suspicious URLs on mobile browsers.
- Check Mozilla advisory for any revised vendor guidance.
Validation and detection
- Inventory iOS devices with Firefox installed.
- Confirm installed Firefox for iOS version is 134 or later.
- Review MDM or app store update reporting for failures.
- Monitor Mozilla advisory and CVE record for updates.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-346: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-23109 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N2.83.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.mozilla.org/show_bug.cgi?id=1419275CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-06/CVE reference, mozilla
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Origin Validation Error
Origin Validation Error represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.