Security readout for executives and security teams
Plain-English summary
CVE-2025-25248 is a Fortinet availability issue affecting SSL-VPN RDP and VNC bookmarks. An authenticated user could send crafted requests that disrupt SSL-VPN availability. The business risk is service interruption, not data theft, based on the provided CVSS vector.
Executive priority
Treat this as a moderate-priority availability risk for Fortinet remote access services. Prioritize environments where SSL-VPN is business-critical or broadly available to authenticated users.
Technical view
The issue is an integer overflow or wraparound, CWE-190, in FortiOS, FortiProxy, and FortiPAM SSL-VPN RDP/VNC bookmark handling. The CVSS 3.1 score is 4.8 with network attack vector, high attack complexity, low privileges required, no user interaction, and high availability impact only.
Likely exposure
Exposure is likely where affected FortiOS, FortiProxy, or FortiPAM versions are deployed and SSL-VPN RDP or VNC bookmarks are used by authenticated users.
Exploitation context
The provided sources indicate proof-of-concept maturity in CVSS as E:P, but KEV is false and no cited source in the bundle confirms active exploitation.
Researcher notes
Evidence supports denial-of-service risk only: confidentiality and integrity impacts are none in the CVSS vector. The bundle does not provide exploit details, fixed versions, or confirmed active exploitation.
Mitigation direction
- Review Fortinet advisory FG-IR-24-364 for current fixed-version and remediation guidance.
- Review Siemens SSA-864900 if Siemens-managed or bundled products are in scope.
- Inventory FortiOS, FortiProxy, and FortiPAM versions against the listed affected branches.
- Assess whether SSL-VPN RDP or VNC bookmarks are enabled and business-critical.
- Restrict SSL-VPN access to trusted authenticated users where operationally feasible.
Validation and detection
- Confirm affected product and version from asset inventory or device management records.
- Check whether SSL-VPN RDP or VNC bookmarks are configured.
- Review SSL-VPN availability incidents and device logs around authenticated bookmark access.
- Verify scanner findings against Fortinet product, version, and feature usage.
- Track vendor advisories for updated remediation or exploitation information.
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-190: 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-2025-25248 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
- Medium
- CVSS
- 4.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:X/RC:R
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:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:X/RC:R1.63.6fortinetVulnerability scoring details
Base CVSS 3.1 score
4.8MediumVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:X/RC:R
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-24-364CVE 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.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.