BrightSign Digital Signage Diagnostic Web Server up to 8.2.26 Speed Test Service url server-side request forgery

Summaryinfo

A vulnerability identified as critical has been detected in BrightSign Digital Signage Diagnostic Web Server up to 8.2.26. Affected by this vulnerability is an unknown functionality of the component Speed Test Service. Performing a manipulation of the argument url results in server-side request forgery. This vulnerability is identified as CVE-2020-36884. The attack can be initiated remotely. Additionally, an exploit exists.

Detailsinfo

A vulnerability was found in BrightSign Digital Signage Diagnostic Web Server up to 8.2.26. It has been classified as critical. This affects some unknown functionality of the component Speed Test Service. The manipulation of the argument url with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

BrightSign Digital Signage Diagnostic Web Server 8.2.26 and less contains an unauthenticated server-side request forgery vulnerability in the 'url' GET parameter of the Download Speed Test service. Attackers can specify external domains to bypass firewalls and perform network enumeration by forcing the application to make arbitrary HTTP requests to internal network hosts.

The weakness was released by Gjoko Krstic as 48843. The advisory is shared at exploit-db.com. This vulnerability is uniquely identified as CVE-2020-36884 since 12/09/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (48843). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Web Server

Vendor

• BrightSign

Name

• Digital Signage Diagnostic Web Server

Version

• 8.2.0
• 8.2.1
• 8.2.2
• 8.2.3
• 8.2.4
• 8.2.5
• 8.2.6
• 8.2.7
• 8.2.8
• 8.2.9
• 8.2.10
• 8.2.11
• 8.2.12
• 8.2.13
• 8.2.14
• 8.2.15
• 8.2.16
• 8.2.17
• 8.2.18
• 8.2.19
• 8.2.20
• 8.2.21
• 8.2.22
• 8.2.23
• 8.2.24
• 8.2.25
• 8.2.26

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion