CVE-2020-36884

BrightSign Digital Signage Diagnostic Web Server 8.2.26 Unauthenticated SSRF

CVSS 6.9 MEDIUMEPSS 0.8%CWE-918

Vexday Risk Score

28Low

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 6.9EPSS 0.8%KEV nãoPoC —Nuclei simMetasploit —Patch —

Lifecycle

10 Dec 2025Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L

Affected products

BrightSign, LLC · BrightSign Digital Signage Diagnostic Web Server

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References

https://github.com/zeroscience https://www.brightsign.biz https://www.exploit-db.com/exploits/48843 https://www.vulncheck.com/advisories/brightsign-digital-signage-diagnostic-web-server-unauthenticated-ssrf https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5595.php