CVE-2024-21872Public exploitNetwork attack vector

Unauthenticated privileged-page access via forged login cookie

Published Apr 18, 2024 · Updated Aug 1, 2024

Authentication bypass in Electrolink FM/DAB/TV transmitters allows remote attackers to access privileged pages via a forged login cookie. The Appweb management interface trusts the client-controlled Login cookie without validating its value or integrity, exposing admin.htm and terminal.htm. No credentials or user interaction are required; demonstrated requests disclose privileged management pages, while the published impact is confidentiality only.

CVSS severity8.7
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Electrolink FM/DAB/TV transmitters allows remote attackers to access privileged pages via a forged login cookie. The Appweb management interface trusts the client-controlled Login cookie without validating its value or integrity, exposing admin.htm and terminal.htm. No credentials or user interaction are required; demonstrated requests disclose privileged management pages, while the published impact is confidentiality only.

The record

CVE
CVE-2024-21872
Published
Apr 18, 2024
Updated
Aug 1, 2024
Vendor
Electrolink
Product
Digital FM Transmitter
Classifications
CWE-565, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record 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=-
  2. Affected versionversion=15W <=40kW

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Electrolink · Digital FM Transmitterversion=-; version=15W <=40kW
Electrolink · Medium DAB Transmitterversion=1kW; version=2kW; version=500W
Electrolink · Compact FM Transmitterversion=-; version=1kW; version=2kW; version=500W; version=Compact FM Transmitter
Electrolink · Modular FM Transmitterversion=-; version=10kW; version=15kW; version=20kW; version=30kW; version=3kW; version=5kW
Electrolink · High Power DAB Transmitterversion=-; version=2.5kW; version=3kW; version=4kW; version=5kW
Electrolink · UHF TV Transmitterversion=10W <=5kW
Electrolink · Compact DAB Transmitterversion=-; version=100W; version=10W; version=250W
Electrolink · VHF TV Transmitterversion=-; version=BI; version=BIII

Published CVSS scores

8.7ICS-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-565Reliance on Cookies without Validation and Integrity Checking
T1190Exploit Public-Facing Application

Public exploit references

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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