Security readout for executives and security teams
Plain-English summary
Specially crafted network packets can trigger a memory corruption flaw in affected FortiOS and FortiSwitchManager versions. A successful unauthenticated attack could run unauthorized code or commands, potentially compromising confidentiality, integrity, and availability. Exploitation requires high complexity, but the potential business impact is severe.
Executive priority
Treat as a high-priority network appliance remediation. Prioritize externally reachable or broadly accessible systems because exploitation needs no credentials and successful compromise could affect all three major security objectives. Confirm vendor-supported upgrade targets promptly.
Technical view
CVE-2025-25249 is a network-reachable heap-based buffer overflow, CWE-122. CVSS 3.1 scores it 7.4: no privileges or user interaction are required, attack complexity is high, and successful exploitation can have high confidentiality, integrity, and availability impact.
Likely exposure
Exposure exists where FortiOS 7.6.0–7.6.3, 7.4.0–7.4.8, 7.2.0–7.2.11, 7.0.0–7.0.17, any 6.4 release, or FortiSwitchManager 7.2.0–7.2.6 or 7.0.0–7.0.5 can receive attacker-controlled network traffic.
Exploitation context
The bundle does not establish active exploitation, and the CVE is not listed as KEV. The CVSS temporal metric E:P indicates proof-of-concept maturity, but no supporting exploit details are provided. High attack complexity may reduce reliability, not potential impact.
Researcher notes
The source description provides broader affected ranges than the structured affected examples, which appear incomplete. Their defaultStatus values should not be interpreted as overriding the explicit ranges. The bundle does not identify the vulnerable service, packet protocol, fixed versions, indicators, or confirmed attacks; consult the vendor advisories for those details.
Mitigation direction
- Check Fortinet advisory FG-IR-25-084 for the exact fixed releases and vendor-approved remediation.
- Upgrade affected FortiOS and FortiSwitchManager installations according to Fortinet guidance.
- Reduce untrusted network reachability to affected appliances until remediation is complete.
- Review the Siemens advisory where relevant to Siemens-managed environments containing affected components.
Validation and detection
- Inventory FortiOS and FortiSwitchManager installations and record their exact versions.
- Compare each installed version with the complete affected ranges and Fortinet advisory.
- Review appliance logs and monitoring for unexplained crashes, unauthorized changes, or suspicious network activity.
- After remediation, verify the installed release is identified as fixed by Fortinet.
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-122: 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-2025-25249 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
- 7.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C2.25.9fortinetVulnerability scoring details
Base CVSS 3.1 score
7.4HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C
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://fortiguard.fortinet.com/psirt/FG-IR-25-084CVE reference, fortinet
- https://cert-portal.siemens.com/productcert/html/ssa-864900.htmlCVE reference, siemens-SADP
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.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.