Security readout for executives and security teams
Plain-English summary
A highly privileged user can store malicious web content in WatchGuard Fireware OS through the ConnectWise Technology Integration configuration. When another user views the affected interface, that content may run in their browser. The reported impact is limited, but successful abuse could compromise information or actions within the management session.
Executive priority
Treat this as a normal-priority management-plane security update, accelerated for appliances using ConnectWise integration or shared administration. It is not an emergency based on supplied evidence, but privileged stored content can endanger other administrators. Require version confirmation, restricted management access and remediation tracking through completion.
Technical view
CVE-2025-13937 is a stored cross-site scripting vulnerability (CWE-79) in the Fireware OS ConnectWise Technology Integration module. It is network-reachable, low-complexity, requires high privileges and passive user interaction. CVSS 4.0 rates it 4.8, with low confidentiality and integrity impact to a subsequent system and no reported availability impact.
Likely exposure
Exposure is limited to WatchGuard Fireware OS deployments using or permitting access to the ConnectWise integration configuration. The bundle mentions releases 2025.1 and 12.0, but its duplicated version records and default-unaffected status do not establish precise affected ranges. Confirm applicability against WatchGuard's advisory and each appliance's installed release.
Exploitation context
The bundle provides no evidence of active exploitation, and the CVE is not identified as being in CISA's Known Exploited Vulnerabilities catalog. Exploitation requires high privileges plus another user's interaction with affected management content, reducing likelihood but leaving administrator sessions and trust boundaries at risk.
Researcher notes
The supplied structured affected data is ambiguous: it references Fireware OS 2025.1 and 12.0, duplicates 12.0, and assigns default status as unaffected. Do not infer exact vulnerable or fixed builds from this bundle. Vendor advisories should control version determinations. No payload details, observed exploitation or explicit fixed version are provided here.
Mitigation direction
- Check both WatchGuard advisories for confirmed affected releases and vendor-provided remediation.
- Apply the WatchGuard-supported fixed release when confirmed for each appliance.
- Restrict ConnectWise integration configuration access to essential trusted administrators.
- Disable the integration where unnecessary, if WatchGuard guidance confirms this is safe.
- Review privileged accounts and revoke access that is no longer required.
Validation and detection
- Inventory Firebox appliances, installed Fireware OS releases and ConnectWise integration usage.
- Compare each release against the affected and fixed ranges in WatchGuard's advisory.
- Review integration configuration changes for unexpected or untrusted stored content.
- Confirm management-interface access is restricted to authorized administrators.
- After remediation, verify the installed release and retest affected configuration rendering safely.
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-2025-13937 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-2025-13937CVE reference, WatchGuard · vendor-advisory
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00022CVE 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.