Spa 301 FirmwareOperating system · Cisco
CVE-2024-20451
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 · uneditedMultiple vulnerabilities in the web-based management interface of Cisco Small Business SPA300 Series IP Phones and Cisco Small Business SPA500 Series IP Phones could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly. These vulnerabilities exist because HTTP packets are not properly checked for errors. An attacker could exploit this vulnerability by sending a crafted HTTP packet to the remote interface of an affected device. A successful exploit could allow the attacker to cause a DoS condition on the device.
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 confidenceImproper error checking of HTTP packets in the web-based management interface of Cisco SPA300 and SPA500 series IP phones allows unauthenticated remote attackers to send crafted HTTP packets that cause the device to unexpectedly reload, resulting in denial of service.
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
Spa 301 FirmwareOperating system
all versions
Spa 303 FirmwareOperating system
all versions
Spa 501g FirmwareOperating system
all versions
Spa 502g FirmwareOperating system
all versions
Spa 504g FirmwareOperating system
all versions
Spa 508g FirmwareOperating system
all versions
Spa 509g FirmwareOperating system
all versions
Spa 512g FirmwareOperating system
all 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 IP phone modelAccess the device web interface and check the model number displayed on the status or administration page, or look at the physical device labelAffected if The model is one of: Spa 301, Spa 303, Spa 501g, Spa 502g, Spa 504g, Spa 508g, Spa 509g, or Spa 512g
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Verify the web-based management interface is enabledCheck the device web interface under Administration > Web Management or similar settings to see if the HTTP/HTTPS management interface is turned onAffected if Web-based management is enabled on the device
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Check network accessibility of the web interfaceDetermine if the device web management port (typically HTTP port 80 or HTTPS port 443) is accessible from untrusted networks by reviewing firewall rules, NAT configurations, or VLAN settingsAffected if The web management interface is exposed to the internet or untrusted networks (not behind a restricted VPN or ACL)
You are affected if you are using any of the listed SPA300 or SPA500 series models with the web-based management interface enabled and accessible from untrusted networks.
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 firmware updates when available; if remote management is not required, disable the web interface or restrict access to trusted networks.
Fix this in Spa 301 Firmware
Scoped from the published advisory
- Consultation3.0 h
- Implementation6.0 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 $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-20451 — 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-2024-20451 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
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