Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated network attacker crash affected WatchGuard VPN services, disrupting remote-user or site-to-site connectivity. The supplied data indicates availability impact only; it does not report data theft, modification, or device takeover.
Executive priority
Treat this as a high-priority availability risk where affected Fireboxes provide critical remote access or site connectivity. Rapidly identify exposed configurations and schedule vendor-approved remediation. Escalate urgency for appliances whose VPN interruption would materially disrupt operations.
Technical view
CVE-2025-11838 is a Fireware OS iked memory-corruption issue classified as CWE-763. Network-reachable, low-complexity attacks require no privileges or user interaction and can cause high availability impact. Exposure involves Mobile User VPN with IKEv2 and Branch Office VPN using IKEv2 with a dynamic gateway peer.
Likely exposure
The bundle lists Fireware OS 2025.1 and 12.6.1 as affected. Risk is configuration-dependent: prioritize appliances running those versions with the identified IKEv2 VPN modes enabled and reachable by untrusted networks. Exact fixed versions are not provided in the bundle.
Exploitation context
The supplied record is not marked as CISA KEV, and no cited source in the bundle establishes active exploitation. Attack feasibility remains concerning because the CVSS 4.0 assessment describes network access, low complexity, no privileges, and no user interaction. Absence from KEV does not prove exploitation is absent.
Researcher notes
CVSS 4.0 is 8.7 with high vulnerable-system availability impact and no stated confidentiality or integrity impact. The bundle identifies memory corruption and CWE-763 but provides insufficient detail to establish the precise trigger, crash behavior, affected model range, fixed releases, or code-execution potential.
Mitigation direction
- Check WatchGuard's advisory for confirmed fixed releases and configuration-specific guidance.
- Upgrade affected appliances according to WatchGuard's documented remediation path.
- Inventory IKEv2 Mobile User VPN and dynamic-peer Branch Office VPN configurations.
- Use only vendor-supported compensating controls if immediate upgrading is operationally impossible.
Validation and detection
- Confirm each Firebox model and installed Fireware OS version.
- Audit whether the identified IKEv2 VPN configurations are enabled.
- Review monitoring records for iked crashes, restarts, or unexplained VPN outages.
- After remediation, verify the installed release against WatchGuard's 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-763: 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-2025-11838 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
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/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:N/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
8.7HighVector: CVSS:4.0/AV:N/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-2025-11838CVE reference, WatchGuard · vendor-advisory
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00018CVE reference, WatchGuard
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.
Release of Invalid Pointer or Reference
Release of Invalid Pointer or Reference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.