A security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024.

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• cpe totolink/a3300r firmware17.0.0cu.557_b20221024

How to fix CVE-2026-5102

• Recommended remediation

  A patch or advisory reference is linked. Open the original publisher for availability by product version.

• Official advisories

  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Mar 30, 2026 · NIST NVD

   Detected

   A security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024. This vulnerability affects the function setSmartQosCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument qos_up_bw results in command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

2. Jun 17, 2026 · NIST NVD

   Updated

   A security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024. This vulnerability affects the function setSmartQosCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument qos_up_bw results in command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Sources

• CVE.orgVulnerability recordCVE-2026-5102

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-5102

  30-day exploitation probability 3.5%

  first.org
• NIST NVDVulnerability recordCVE-2026-5102

  A security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024. This vulnerability affects the function setSmartQosCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument qos_up_bw results in command injection. The

  nvd.nist.gov

References

• Exploit · github.com
• Permissions Required · vuldb.com
• Third Party Advisory · vuldb.com
• Third Party Advisory · vuldb.com
• Product · totolink.net

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.