CVE-2018-11877
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 · uneditedWhen the buffer length passed is very large in WLAN, bounds check could be bypassed leading to potential buffer overwrite in Snapdragon Mobile in version SD 835, SD 845, SD 850, SDA660.
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 · high confidenceBuffer overflow vulnerability in the WLAN component of Qualcomm Snapdragon processors (SD 835, SD 845, SD 850, SDA660). When a very large buffer length is passed, bounds checking can be bypassed, potentially allowing an attacker to overwrite adjacent memory regions.
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 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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/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 processor modelCheck the device or system information to determine the exact Snapdragon chip model. On Android, this may be visible in About Phone > Model or through commands like 'getprop ro.product.board' or 'cat /proc/cpuinfo'. On other systems, check BIOS/UEFI or system documentation.Affected if The processor is one of: SD 835, SD 845, SD 850, or SDA660.
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Verify the WLAN firmware versionCheck the WLAN firmware version installed on the system. On Linux, this may be available via 'iw version' or by examining driver firmware files in /lib/firmware. On Android, check under Settings > About Phone > Wi-Fi MAC address or through diagnostic tools.Affected if The device uses one of the affected Snapdragon variants (SD 835, SD 845, SD 850, SDA660). Note: all firmware versions are affected per the advisory.
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Confirm the WLAN component is activeVerify that the WLAN (Wi-Fi) functionality is enabled and in use on the device. Check if the wireless interface (such as wlan0) is present and active using commands like 'ip link show' or 'iw dev'.Affected if WLAN is enabled and actively processing network traffic, as the vulnerability is triggered when a very large buffer length is passed to the WLAN component.
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Inspect for anomalous WLAN behaviorMonitor network traffic logs and WLAN driver diagnostics for unexpected buffer allocation requests or memory anomalies. On Linux, tools like 'iw list' can show driver capabilities, and tcpdump/wireshark can capture unusual packet patterns.Affected if Unusually large buffer length values are being processed by the WLAN component, indicating potential exploitation attempts.
The environment is affected if it contains a Qualcomm Snapdragon SD 835, SD 845, SD 850, or SDA660 processor with WLAN functionality enabled, regardless of firmware version.
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 firmware updates released by device OEMs that address this vulnerability in the affected Snapdragon variants. Until patches are available, monitor network activity for anomalies.
- Consultation8.0 h
- Implementation4.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,320.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-11877 — 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-2018-11877 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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