Security readout for executives and security teams
Plain-English summary
A privileged Firebox administrator could abuse the certificate-request CLI function to corrupt memory and run code on the appliance. Successful exploitation could compromise the firewall’s confidentiality, integrity, and availability. The attacker must already have privileged authenticated access, which reduces broad internet risk but makes stolen or misused administrator credentials important.
Executive priority
Prioritize prompt inventory and vendor-guidance review for exposed or business-critical Fireboxes. Remediate confirmed vulnerable builds quickly, especially where management access is broad or administrator credentials may be compromised. This is serious but not an unauthenticated mass-exploitation condition based on the supplied evidence.
Technical view
CVE-2025-12026 is a CWE-787 out-of-bounds write in Fireware OS certd, reachable through specially crafted certificate-request CLI commands. CVSS 4.0 rates it 8.6: network-accessible, low complexity, no user interaction, but requiring high privileges. The supplied version data lists Fireware OS 2025.1 and 12.0, although exact affected builds are unclear.
Likely exposure
Exposure is limited to WatchGuard Firebox systems running builds confirmed vulnerable by WatchGuard and accessible to authenticated privileged users. The bundle’s affected-version entries are ambiguous and include a default status of unaffected. Organizations should inventory exact Fireware builds and compare them directly with the vendor advisory.
Exploitation context
The supplied sources do not report CISA KEV inclusion or confirmed active exploitation. Exploitation requires an authenticated privileged account and specially crafted CLI input. Primary scenarios therefore include compromised administrator credentials, malicious insiders, or attackers who have already gained elevated management access.
Researcher notes
The CVSS 4.0 vector is AV:N/AC:L/AT:N/PR:H/UI:N with high vulnerable-system confidentiality, integrity, and availability impacts. CWE-787 supports memory corruption and potential code execution. Exact vulnerable and fixed builds, technical root cause, detection indicators, and exploitation evidence are not established by the supplied bundle; consult the WatchGuard advisories.
Mitigation direction
- Check both WatchGuard advisories for exact affected builds and vendor-prescribed remediation.
- Apply WatchGuard-provided fixed firmware where the advisory confirms an affected installation.
- Restrict management interfaces and CLI access to trusted administrative networks.
- Remove unnecessary privileged accounts and enforce strong administrator authentication controls.
- Monitor vendor guidance for revisions because the supplied affected-version data is ambiguous.
Validation and detection
- Record each Firebox model and exact Fireware OS build.
- Compare every build with the affected and fixed versions in WatchGuard’s advisory.
- Review privileged accounts and confirm each still requires certificate-request CLI access.
- Review management logs for unusual certificate-request activity by privileged users.
- Investigate unexpected certd failures or appliance instability around administrative sessions.
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-787: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-12026 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
- 8.6 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/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:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——WatchGuardVulnerability scoring details
Base CVSS 4.0 score
8.6HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/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-2025-12026CVE reference, WatchGuard · vendor-advisory
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00017CVE 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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.