Security readout for executives and security teams
Plain-English summary
A stored cross-site scripting flaw in WatchGuard Fireware OS’s Gateway Wireless Controller can preserve malicious web content that executes when another user views it. Exploitation requires high privileges and victim interaction, limiting likelihood, but could compromise information or actions within the user’s browser session.
Executive priority
Schedule prompt remediation through the normal vulnerability-management process. Prioritize appliances with broadly reachable management interfaces, active wireless-controller use, or multiple administrators. Emergency response is not supported by the supplied evidence, but delayed action increases risk if privileged credentials are compromised.
Technical view
CVE-2025-13939 is a CWE-79 stored XSS vulnerability in the Gateway Wireless Controller module. CVSS 4.0 scores it 4.8: network-reachable, low complexity, high privileges, and passive user interaction. The vector indicates low subsequent confidentiality and integrity impact, with no stated availability impact.
Likely exposure
Potential exposure is limited to Firebox deployments using the Gateway Wireless Controller on an affected Fireware OS release. The bundle lists versions 2025.1, 12.0, and 11.7.2, but its version-status data is ambiguous; confirm exact affected and fixed releases through WatchGuard’s advisory.
Exploitation context
The bundle provides no evidence of active exploitation, and the CVE is not listed as KEV. An attacker would need high privileges to store the content, followed by another user viewing the affected page. This reduces opportunistic risk but remains relevant where administrative access is shared or compromised.
Researcher notes
The supplied version entries include “defaultStatus: unaffected,” making precise range interpretation unsafe without the vendor advisory. The CVSS vector reports no direct vulnerable-system impact but low confidentiality and integrity impact to a subsequent system. No exploit method, observed campaign, patch version, or product-specific workaround is established by the bundle.
Mitigation direction
- Review WatchGuard’s advisory for exact affected releases and vendor-supported remediation.
- Upgrade to a vendor-designated fixed Fireware OS release when confirmed.
- Restrict Gateway Wireless Controller access to trusted administrators and management networks.
- Disable the Gateway Wireless Controller if unused and operationally safe.
Validation and detection
- Inventory Firebox appliances and record their exact Fireware OS versions.
- Identify appliances where the Gateway Wireless Controller is enabled or used.
- Compare each deployment against WatchGuard’s current affected-version guidance.
- Confirm administrative access is restricted and unnecessary privileged accounts are removed.
- After remediation, verify the installed release matches WatchGuard’s fixed-version guidance.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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-2025-13939 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
- 4.8 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N——WatchGuardVulnerability scoring details
Base CVSS 4.0 score
4.8MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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://psirt.watchguard.com/CVE-2025-13939CVE reference, WatchGuard · vendor-advisory
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00024CVE reference, WatchGuard · vendor-advisory
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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.