CVE-2024-55599Network attack vector

DNS-filter bypass via unchecked type 65 requests

Published Jul 8, 2025 · Updated Aug 11, 2026

Improper DNS request validation in FortiOS and FortiProxy allows remote attackers to bypass DNS filtering with type 65 requests. The filter fails to apply its normal policy decision to HTTPS resource-record queries, which are used by Apple devices, and permits requests that should be blocked. No authentication is required, but traffic must traverse an affected, enabled DNS filter; the reported consequence is reduced filtering integrity, not device-data disclosure or service interruption.

CVSS severity5.3
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper DNS request validation in FortiOS and FortiProxy allows remote attackers to bypass DNS filtering with type 65 requests. The filter fails to apply its normal policy decision to HTTPS resource-record queries, which are used by Apple devices, and permits requests that should be blocked. No authentication is required, but traffic must traverse an affected, enabled DNS filter; the reported consequence is reduced filtering integrity, not device-data disclosure or service interruption.

The record

CVE
CVE-2024-55599
Published
Jul 8, 2025
Updated
Aug 11, 2026
Vendor
Siemens
Product
RUGGEDCOM APE1808
Classifications
CWE-358, T1211
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 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 privilegesunauthenticated

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
Fortinet · FortiProxyversion=7.0.0 <=7.0.21; version=7.2.0 <=7.2.14; version=7.4.0 <=7.4.8; version=7.6.0 <=7.6.1

Published CVSS scores

5.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-358Improperly Implemented Security Check for Standard
T1211Exploitation for Defense Evasion

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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