CVE-2023-31893
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedTelefnica Brasil Vivo Play (IPTV) Firmware: 2023.04.04.01.06.15 is vulnerable to Denial of Service (DoS) via DNS Recursion.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThe Telefônica Brasil Vivo Play IPTV firmware version 2023.04.04.01.06.15 contains a DNS recursion vulnerability that allows remote attackers to cause a Denial of Service. The DNS service on the device accepts recursive queries, which can be exploited to exhaust resources or trigger service disruption.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 2023.04.04.01.06.15CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify firmware versionAccess the device management interface or check system information settings to determine the installed firmware version. Look for a field labeled 'Firmware Version' or 'Software Version' in the device status or about section.Affected if The installed firmware version is exactly 2023.04.04.01.06.15
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Locate DNS service statusIn the device management interface, navigate to network settings or services configuration. Look for DNS server or resolver settings. Check if a DNS service is listed as enabled or running.Affected if A DNS service is enabled and running on the device
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Verify DNS recursion configurationWithin the DNS settings, locate the recursion or 'allow recursive queries' option. This may be labeled as 'Enable Recursion', 'Allow Recursive Queries', or similar. Determine whether this setting is enabled.Affected if DNS recursion is enabled in the DNS configuration
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Check DNS query source restrictionsIn the DNS or network access settings, look for any IP access controls, query source restrictions, or ACLs that limit which hosts can send DNS queries to the device. Determine if any restrictions are configured.Affected if No source IP restrictions are configured for DNS queries, meaning the DNS service accepts queries from any source
The environment is affected if the device runs firmware version 2023.04.04.01.06.15 with the DNS service enabled and DNS recursion allowed without source restrictions.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataDisable DNS recursion on the affected IPTV devices and restrict DNS queries to authorized internal sources only through the device management interface.
- Consultation3.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-31893 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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