Security readout for executives and security teams
Plain-English summary
A nearby, unauthenticated attacker could trigger a memory-handling flaw in the Windows WatchGuard Agent discovery service and crash it. Exposure requires access to the same local network, reducing internet-wide risk but making compromised internal networks important. The supplied evidence does not establish data theft, code execution, or active exploitation.
Executive priority
Prioritize prompt inventory and vendor-guidance review, especially in flat, guest-accessible, or weakly segmented networks. The flaw is high severity and remotely triggerable from an adjacent network without credentials, but the supplied evidence supports service disruption rather than internet-scale compromise. Escalate systems confirmed on version 1.0.0.0 and reachable by untrusted local devices.
Technical view
CVE-2026-41286 is a stack-based buffer overflow (CWE-121) in the WatchGuard Agent discovery service on Windows. The supplied record lists version 1.0.0.0 and CVSS 4.0 score 7.1. Exploitation requires adjacent-network access, with low complexity, no privileges, and no user interaction. The narrative impact is service denial of service.
Likely exposure
Likely exposure is limited to Windows systems running WatchGuard Agent 1.0.0.0 whose discovery service is reachable from potentially hostile devices on the same local network. The bundle provides no ports, protocols, deployment prevalence, or confirmed exposure beyond that version. Other versions should not be assumed affected without vendor confirmation.
Exploitation context
The source bundle does not identify active exploitation, public exploit availability, or CISA KEV inclusion. The stated attacker must be on the same local network and needs neither authentication nor user interaction. Treat hostile Wi-Fi, guest networks, compromised endpoints, and weakly segmented internal networks as relevant exposure contexts, subject to actual service reachability.
Researcher notes
The supplied narrative describes a service crash, while the provided CVSS vector encodes high vulnerable-system integrity impact and no availability impact. This apparent inconsistency should be checked against the current CVE and vendor records. No affected protocol, port, malformed input details, patch version, or root-cause depth is supplied; avoid inferring code execution or additional affected releases.
Mitigation direction
- Review WatchGuard advisories for the vendor-supported fixed release or remediation instructions.
- Identify Windows systems running WatchGuard Agent version 1.0.0.0.
- Restrict discovery-service reachability to trusted network segments where operationally feasible.
- Separate untrusted, guest, and user networks from affected management endpoints.
- Monitor affected hosts for repeated discovery-service crashes until remediation is confirmed.
Validation and detection
- Inventory installed WatchGuard Agent versions across Windows endpoints.
- Confirm whether the discovery service is enabled and listening on affected systems.
- Assess service reachability from adjacent untrusted or user-controlled network segments.
- Review service and Windows event logs for unexplained crashes or restart patterns.
- Verify remediation status against the current WatchGuard advisory.
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-121: 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-2026-41286 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
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/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:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N——WatchGuardVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/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-2026-41286CVE reference, WatchGuard · vendor-advisory
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00011CVE 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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.