# CVE-2026-31169: CVE-2026-31169

Status: published. Published: 2026-04-23. Updated: 2026-11-11.

An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the week parameter to /cgi-bin/cstecgi.cgi.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- totolink / a3300r_firmware: 17.0.0cu.557_b20221024 (affected, custom). Source: NVD; conditional on NVD configuration criteria

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:totolink:a3300r_firmware:17.0.0cu.557_b20221024:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      },
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:h:totolink:a3300r:-:*:*:*:*:*:*:*",
            "vulnerable": false
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "AND"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N; source: NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable yes; technical impact partial; source NVD SSVC: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- Weaknesses: CWE-77

## Exploit evidence

- exploit: https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-week-cmd-injection (cve@mitre.org)
- exploit: https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-week-cmd-injection (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## References

- https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-week-cmd-injection (cve@mitre.org; Exploit, Third Party Advisory)

- https://github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-week-cmd-injection (134c704f-9b21-4f2e-91b3-4a467353bcc0; Exploit, Third Party Advisory)

## Provenance

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31169; retrieved 2026-11-12; source updated 2026-11-11

Revision: c179a8934513248de19fc24109a626697d447e89e24f3fba4eb870b50f08f03d

Canonical: https://y2.dev/cve/CVE-2026-31169

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.