CVE-2026-4497
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 was determined in Totolink WA300 5.2cu.7112_B20190227. Affected by this issue is the function recvUpgradeNewFw of the file /cgi-bin/cstecgi.cgi. This manipulation causes os command injection. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized.
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 confidenceOS command injection vulnerability in the recvUpgradeNewFw function of /cgi-bin/cstecgi.cgi on Totolink WA300 router firmware 5.2cu.7112_B20190227. The function handling firmware upgrades fails to sanitize input before passing it to system shell commands, allowing remote attackers to execute arbitrary OS commands.
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= 5.2cu.7112_b20190227CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 installed firmware versionAccess the router web administration interface and navigate to System Status or Firmware version page, or use telnet/SSH to run 'cat /proc/version' or '固件版本' related commandAffected if Firmware version matches exactly 5.2cu.7112_b20190227
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Verify vulnerable CGI binary existsCheck if /cgi-bin/cstecgi.cgi exists on the device by accessing it via HTTP/HTTPS or using telnet/SSH to list the /cgi-bin/ directoryAffected if The file /cgi-bin/cstecgi.cgi is present on the device
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Confirm firmware upgrade functionality is accessibleAttempt to access the firmware upgrade web interface or check if the recvUpgradeNewFw function is exposed via the CGI endpointAffected if The firmware upgrade function (recvUpgradeNewFw) is accessible via the web interface or CGI binary
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Check if remote web management is enabledLog into router admin panel and verify Status or Network settings for remote management options, or test connectivity to ports 80/443 from external IPAffected if Remote web management (HTTP/HTTPS from WAN) is enabled and accessible
Device is affected if it runs firmware version 5.2cu.7112_b20190227 AND has the /cgi-bin/cstecgi.cgi binary with the firmware upgrade function accessible, especially if remote web management is enabled.
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 vendor-supplied patched firmware; if unavailable, disable remote web management interfaces or isolate the device behind a firewall to reduce attack surface.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-4497 — 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-2026-4497 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
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