CVE-2025-25248Network attack vector

SSL-VPN interruption via bookmark integer overflow

Published Aug 12, 2025 · Updated Aug 11, 2026

Integer overflow in SSL-VPN RDP and VNC bookmarks in FortiOS, FortiProxy, and FortiPAM allows remote authenticated users to interrupt SSL-VPN. Fortinet has not disclosed the arithmetic operation or input field whose overflow is triggered by crafted bookmark requests. Exploitation requires authenticated SSL-VPN access and a configured RDP or VNC bookmark; Siemens RUGGEDCOM APE1808 devices running affected Fortinet NGFW inherit the exposure.

CVSS severity6.0
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in SSL-VPN RDP and VNC bookmarks in FortiOS, FortiProxy, and FortiPAM allows remote authenticated users to interrupt SSL-VPN. Fortinet has not disclosed the arithmetic operation or input field whose overflow is triggered by crafted bookmark requests. Exploitation requires authenticated SSL-VPN access and a configured RDP or VNC bookmark; Siemens RUGGEDCOM APE1808 devices running affected Fortinet NGFW inherit the exposure.

The record

CVE
CVE-2025-25248
Published
Aug 12, 2025
Updated
Aug 11, 2026
Vendor
Siemens
Product
RUGGEDCOM APE1808
Classifications
CWE-190, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · RUGGEDCOM APE1808version=0 <*
Fortinet · FortiOSversion=6.4.0 <=6.4.16; version=7.0.0 <=7.0.17; version=7.2.0 <=7.2.10; version=7.4.0 <=7.4.7; version=7.6.0 <=7.6.2
Fortinet · FortiPAMversion=1.0.0 <=1.0.3; version=1.1.0 <=1.1.2; version=1.2.0; version=1.3.0 <=1.3.1; version=1.4.0 <=1.4.2; version=1.5.0
Fortinet · FortiProxyversion=2.0.0 <=2.0.14; version=7.0.0 <=7.0.21; version=7.2.0 <=7.2.14; version=7.4.0 <=7.4.3; version=7.6.0 <=7.6.2

Published CVSS scores

6.0SiemensCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.8FortinetCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:X/RC:R

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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