CVE-2021-22677
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 · uneditedAn integer overflow exists in the APIs of the host MCU while trying to connect to a WIFI network may lead to issues such as a denial-of-service condition or code execution on the SimpleLink Wi-Fi (MSP432E4 SDK: v4.20.00.12 and prior, CC32XX SDK v4.30.00.06 and prior, CC13X0 SDK versions prior to v4.10.03, CC13X2 and CC26XX SDK versions prior to v4.40.00, CC3200 SDK v1.5.0 and prior, CC3100 SDK v1.3.0 and prior).
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 confidenceAn integer overflow vulnerability exists in the SimpleLink Wi-Fi host MCU APIs during Wi-Fi network connection. When connecting, certain API parameters can overflow due to improper bounds checking, potentially allowing an attacker to trigger a denial-of-service condition or achieve code execution on the affected device.
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<= 1.3.0<= 1.5.0< 4.10.03< 4.40.00< 4.40.00<= 4.30.00.06<= 4.20.00.12CVSS 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 SDK version in useReview the SDK release files, header files, or project documentation to determine the exact SDK version number (e.g., check SDK release notes, version.h files, or build logs)Affected if The SDK version matches or falls within the affected ranges: CC3100 <=1.3.0, CC3200 <=1.5.0, CC13x0 <4.10.03, CC13x2 <4.40.00, CC26xx <4.40.00, CC32xx <=4.30.00.06, MSP432E4 <=4.20.00.12
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Confirm the hardware platformIdentify which TI SimpleLink device is being used (CC3100, CC3200, CC13x0, CC13x2, CC26xx, CC32xx, or MSP432E4) from schematics, BOM, or device identification APIsAffected if The device uses any of the affected SimpleLink platforms listed in the SDK version check
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Check for Wi-Fi connection codeSearch source code for Wi-Fi connection API calls such as sl_WlanConnect, sl_Connect, or similar Wi-Fi provisioning/connection functions that pass user-controlled parametersAffected if The application includes code that initiates Wi-Fi network connections using the SimpleLink host MCU APIs
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Review API parameter handlingInspect the Wi-Fi connection code paths to see if length/count parameters passed to connection APIs could originate from untrusted sources or exceed expected boundsAffected if Connection API parameters are derived from external input or lack explicit bounds validation before being passed to Wi-Fi connection functions
A user is affected if their deployed system uses any of the listed SDK versions AND incorporates Wi-Fi connection functionality using the vulnerable SimpleLink APIs.
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 data4.10.034.40.00
Upgrade to non-vulnerable SDK versions: MSP432E4 SDK v4.20.00.13+, CC32XX SDK v4.30.00.07+, CC13X0 SDK v4.10.03+, CC13X2/CC26XX SDK v4.40.00+, CC3200 SDK v1.5.1+, and CC3100 SDK v1.3.1+. Review and validate all Wi-Fi connection code for integer overflow handling before deployment.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-22677 — 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-2021-22677 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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