CVE-2021-33499
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 · uneditedPexip Infinity before 26 allows remote denial of service because of missing H.264 input validation (issue 2 of 2).
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 confidencePexip Infinity before version 26 contains a denial of service vulnerability due to missing input validation when processing H.264 video streams. A remote attacker can send specially crafted H.264 data to trigger the vulnerability, causing the service to become unavailable.
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< 26CVSS 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 Pexip Infinity versionAccess the Pexip Infinity admin interface or check system documentation for the installed version numberAffected if The installed version is before version 26 (e.g., versions 25.x, 24.x, etc.)
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Verify H.264 video processing is enabledCheck the Pexip Infinity conference node or transcoder configuration settings for H.264 codec enablementAffected if H.264 video decoding/processing is actively enabled on the system
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Determine if system accepts external video streamsReview the deployment configuration to see if the Pexip Infinity node accepts video calls from untrusted or external sourcesAffected if The system accepts H.264 video streams from remote or untrusted participants without strict source validation
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Review logs for H.264 processing anomaliesExamine Pexip Infinity service logs for errors, crashes, or denial of service events related to video stream handlingAffected if Logs show recurring failures, timeouts, or crashes associated with H.264 stream processing
A user is affected if they are running any Pexip Infinity version before 26 with H.264 video processing enabled and exposed to remote video sources.
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.
dbcve · scoped26
Upgrade Pexip Infinity to version 26 or later to obtain the fixed release that includes proper H.264 input validation. Prior to upgrading, consider network segmentation and restricting untrusted video sources.
Infinity version 26
- Review Pexip Infinity upgrade documentation at docs.pexip.com for version 26 upgrade procedures
- Ensure you have a complete backup of your current Infinity configuration
- Schedule a maintenance window as upgrades may require service interruption
- Upgrade your Pexip Infinity deployment to version 26 or later
- Verify the upgrade was successful and test H.264 functionality
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,072.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-33499 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
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-2021-33499 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data