iOSOperating system · Cisco
CVE-2022-20761
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 · uneditedA vulnerability in the integrated wireless access point (AP) packet processing of the Cisco 1000 Series Connected Grid Router (CGR1K) could allow an unauthenticated, adjacent attacker to cause a denial of service condition on an affected device. This vulnerability is due to insufficient input validation of received traffic. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to cause the integrated AP to stop processing traffic, resulting in a DoS condition. It may be necessary to manually reload the CGR1K to restore AP operation.
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 vulnerability in the integrated wireless access point (AP) packet processing of Cisco 1000 Series Connected Grid Router (CGR1K) allows an unauthenticated, adjacent attacker to cause denial of service by sending crafted traffic. The issue stems from insufficient input validation of received traffic, causing the AP to stop processing traffic and potentially requiring a manual device reload to restore operation.
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
iOSOperating system
= 15.4\(1\)cg= 15.4\(2\)cg= 15.4\(3\)m= 15.4\(3\)m1= 15.4\(3\)m2= 15.4\(3\)m3= 15.4\(3\)m4= 15.4\(3\)m5= 15.4\(3\)m6= 15.4\(3\)m6a= 15.4\(3\)m7= 15.4\(3\)m8CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/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 device modelRun 'show version' or 'show inventory' command and look for Cisco 1000 Series Connected Grid Router or CGR1K in the outputAffected if Device is not a Cisco CGR1K
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Check iOS versionRun 'show version' and locate the firmware version numberAffected if Version matches 15.4(1)cg, 15.4(2)cg, 15.4(3)m, 15.4(3)m1, 15.4(3)m2, 15.4(3)m3, 15.4(3)m4, 15.4(3)m5, 15.4(3)m6, 15.4(3)m6a, 15.4(3)m7, or 15.4(3)m8
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Verify wireless AP feature is enabledRun 'show ip interface brief' or 'show interface' to check for wireless AP interfaces; or run 'show wireless' commands if availableAffected if Integrated wireless access point interfaces are configured and active
User is affected if device is a CGR1K running one of the listed iOS versions AND the integrated wireless AP feature is enabled and processing traffic.
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 Cisco security updates for CGR1K when released; if exploited, a manual reload of the device may be required to restore AP functionality.
Fix this in iOS
Scoped from the published advisory
- Consultation4.0 h
- Implementation3.0 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 $3,680.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-20761 — 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-2022-20761 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
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