# CVE-2023-49646: CVE-2023-49646

Status: published. Published: 2023-12-13. Updated: 2026-11-02.

Improper authentication in some Zoom clients before version 5.16.5 may allow an authenticated user to conduct a denial of service via network access.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Zoom Video Communications, Inc. / Zoom Clients: See references (affected). Source: CNA: Zoom; platforms: Windows, MacOS, Linux, iOS, Android

## NVD configuration conditions

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

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:zoom:meeting_software_development_kit:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.16.5",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:zoom:video_software_development_kit:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.16.5",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:zoom:virtual_desktop_infrastructure:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.14.14",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:zoom:virtual_desktop_infrastructure:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "5.15.12",
            "versionStartIncluding": "5.15.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:zoom:zoom:*:*:*:*:*:android:*:*",
            "versionEndExcluding": "5.16.5",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:zoom:zoom:*:*:*:*:*:iphone_os:*:*",
            "versionEndExcluding": "5.16.5",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:zoom:zoom:*:*:*:*:*:linux:*:*",
            "versionEndExcluding": "5.16.5",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:zoom:zoom:*:*:*:*:*:macos:*:*",
            "versionEndExcluding": "5.16.5",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:zoom:zoom:*:*:*:*:*:windows:*:*",
            "versionEndExcluding": "5.16.5",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L; source: CNA: Zoom

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: nvd@nist.gov

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L; source: NVD: security@zoom.us

- CISA KEV: No listing in collected sources

- EPSS: 0.40% as of 2026-11-02; percentile 34.55%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-347, CWE-287

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.zoom.com/en/trust/security-bulletin/ZSB-23062/ (CNA: Zoom)

- https://www.zoom.com/en/trust/security-bulletin/ZSB-23062/ (ADP: CVE; x_transferred)

- https://www.zoom.com/en/trust/security-bulletin/ZSB-23062/ (security@zoom.us; Vendor Advisory)

- https://www.zoom.com/en/trust/security-bulletin/ZSB-23062/ (af854a3a-2127-422b-91ae-364da2661108; Vendor Advisory)

## Provenance

- CNA: Zoom: https://www.cve.org/CVERecord?id=CVE-2023-49646; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49646; retrieved 2026-11-03; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2023-49646; retrieved 2026-11-02; source updated Not reported

Revision: 5991aa8f3169173b5b5b8bd28920818953add1debe6564dace7f9ca8a6b4429e

Canonical: https://y2.dev/cve/CVE-2023-49646

## 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.