CVE-2023-33056
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 · uneditedTransient DOS in WLAN Firmware when firmware receives beacon including T2LM IE.
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 confidenceA denial of service vulnerability exists in WLAN firmware where processing a beacon frame containing a specifically crafted T2LM (Traffic to Link Mapping) Information Element causes the firmware to crash or become unresponsive. The vulnerability is transient, meaning the device typically recovers but service is interrupted during the incident.
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 dataall versionsall versionsall versionsall versionsall versionsall versionsall versionsall versionsCVSS 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 the WLAN hardware chip or platform modelCheck device documentation, system logs, or hardware information to determine if the device uses Qualcomm Ar8035, Csr8811, Wcn685x, Wcn785x, or Immersive Home (214/216) chipsets. On Linux, this may appear in `lspci`, `lsusb`, `ip link`, or `/proc/bus/pci` output.Affected if The device contains any of the listed Qualcomm chip models (Ar8035, Csr8811, Wcn685x, Wcn785x, Immersive Home 214/216).
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Confirm WLAN firmware versionUse vendor-specific commands to retrieve the installed WLAN firmware version. On Linux, this may be found via `iw`, `iwlist`, `ethtool`, or by reading firmware version from `/sys` or device logs. Compare against the affected product list.Affected if The device runs any firmware version on the listed Qualcomm platforms (all versions are affected).
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Check if WLAN interface is activeRun `ip link show` or `iw dev` to list wireless interfaces and verify their state (UP/DOWN). Check if any 802.11 interfaces exist and are enabled.Affected if A WLAN interface is present and configured (the vulnerability triggers upon receiving a crafted beacon frame).
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Monitor for wireless crashes or restartsReview system logs (`dmesg`, `/var/log/syslog`, or journalctl) for wireless driver errors, firmware crashes, or unexpected WLAN interface resets occurring after normal operation.Affected if WLAN interface drops, firmware crashes, or denial of service events are logged, especially in environments with untrusted wireless traffic.
The environment is affected if any device runs WLAN firmware based on the listed Qualcomm chipsets (Ar8035, Csr8811, Wcn685x, Wcn785x, Immersive Home 214/216) and has WLAN functionality enabled, as all firmware versions for these platforms are vulnerable to the T2LM beacon frame crash.
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 dataApply the vendor-supplied firmware update to WLAN devices. If unavailable, consider network segmentation to limit exposure to untrusted wireless networks or temporarily disable WLAN functionality on affected devices.
- Consultation2.0 h
- Implementation4.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-33056 — 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-2023-33056 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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