Security readout for executives and security teams
Plain-English summary
A nearby, unauthenticated attacker could crash the WatchGuard Agent discovery service on Windows. The documented impact is loss of service availability, not data theft or modification. Exploitation requires access to the same local network, reducing internet-wide exposure but increasing concern on shared or insufficiently segmented networks.
Executive priority
Treat this as a high-priority availability issue, especially where affected Windows endpoints share networks with unmanaged or guest devices. It is less urgent than an internet-reachable remote compromise, but unauthenticated exploitation and low attack complexity support prompt inventory, segmentation review, and vendor-directed remediation.
Technical view
CVE-2026-41287 is a stack-based buffer overflow (CWE-121) in the Windows WatchGuard Agent discovery service. It has CVSS 4.0 score 7.1 with adjacent-network access, low complexity, no privileges, and no user interaction. The stated consequence is high availability impact through a service crash; confidentiality and integrity impacts are scored as none.
Likely exposure
The bundle identifies WatchGuard Agent 1.0.0.0 on Windows and lists other versions as unaffected by default. Risk is concentrated on hosts reachable by potentially hostile devices on the same local network. Confirm the precise affected scope against WatchGuard guidance because the supplied evidence names only one version.
Exploitation context
The attacker must be on an adjacent local network but needs no credentials or user interaction. The supplied sources do not establish active exploitation, and the CVE is not marked as present in CISA KEV. KEV absence does not prove exploitation has never occurred.
Researcher notes
The evidence supports denial of service from a stack overflow, not code execution, data disclosure, or data modification. Do not infer broader impact from the vulnerability class alone. The affected-version statement is narrow, and the supplied bundle does not name a fixed release, workaround, proof of concept, or observed campaign.
Mitigation direction
- Inventory Windows systems running WatchGuard Agent and identify version 1.0.0.0.
- Review both WatchGuard advisories for the vendor-supported update or mitigation; none is specified in the supplied summary.
- Restrict untrusted devices from reaching affected hosts across local network segments.
- Prioritize shared, guest-accessible, or weakly segmented networks for remediation.
Validation and detection
- Verify installed WatchGuard Agent versions using approved asset-management records or endpoint tooling.
- Confirm whether the discovery service is running on identified Windows hosts.
- Assess whether untrusted adjacent-network devices can reach affected hosts.
- Review service crash, restart, and availability records for anomalies; crashes alone do not prove exploitation.
- Recheck WatchGuard advisories for corrected-version and deployment details.
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-2026-41287 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:N/VA:H/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:N/VA:H/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:N/VA:H/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-2026-41287CVE reference, WatchGuard · vendor-advisory
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2026-00010CVE 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.