Security readout for executives and security teams
Plain-English summary
An authenticated Firebox administrator could store malicious web content through the spamBlocker configuration. If another administrator later views the affected interface, the content could run in that administrator’s browser and affect limited confidentiality or integrity. The issue applies to locally managed Fireboxes; the supplied evidence does not establish exact affected releases.
Executive priority
Treat this as a planned remediation item with prompt validation. The required administrator access and user interaction reduce urgency, but compromised or malicious administrators could target other privileged users. Escalate priority if affected management interfaces are broadly reachable or administrator activity appears suspicious.
Technical view
CVE-2025-4804 is a stored cross-site scripting vulnerability (CWE-79) in WatchGuard Fireware OS’s spamBlocker module. Exploitation requires high privileges and passive interaction from another user. CVSS 4.0 scores it 4.8, with low subsequent-system confidentiality and integrity impact and no stated availability impact.
Likely exposure
Exposure is limited to locally managed Fireboxes using the relevant spamBlocker functionality and accessible to authenticated administrators. The bundle lists Fireware OS 12.0 and 12.5 as unaffected by default, but does not identify exact affected or fixed versions.
Exploitation context
The attacker must already have an authenticated administrator session and place unsafe content into configuration data. A user must then encounter the stored content in the management interface. The CVE is not listed in KEV, and the supplied sources provide no evidence of active exploitation.
Researcher notes
The supplied vector is 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. Evidence supports stored XSS through spamBlocker on a locally managed Firebox. Exact vulnerable version boundaries, patched releases, exploitation prevalence, and vendor-prescribed workarounds are not established in the bundle.
Mitigation direction
- Check WatchGuard’s advisory for confirmed affected and fixed Fireware releases.
- Upgrade according to WatchGuard guidance if the deployed release is affected.
- Restrict Firebox management access to trusted administrative networks.
- Limit administrator accounts and privileges to essential personnel.
- Review spamBlocker configuration for unexpected or untrusted content.
Validation and detection
- Inventory locally managed Fireboxes and record their Fireware versions.
- Compare each version with WatchGuard’s current advisory.
- Confirm whether the spamBlocker module is configured or administered.
- Review administrator accounts, access history, and recent configuration changes.
- Verify management access is restricted to approved administrators and networks.
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-2025-4804 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.
- Source timelineWatchGuard
Updated to add Fireware OS 12.5.13 as a resolved release
- 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-2025-4804CVE reference, WatchGuard · vendor-advisory
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00006CVE 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.