CVE-2026-3870

{"id": "CVE-2026-3870", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "security@zyxel.com.tw", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "published": "2026-06-02T03:16:16.890", "references": [{"url": "https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-buffer-overflow-vulnerabilities-in-the-upnp-function-of-certain-4g-lte-5g-nr-cpe-and-dsl-ethernet-cpe-06-02-2026", "source": "security@zyxel.com.tw"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Primary", "source": "security@zyxel.com.tw", "description": [{"lang": "en", "value": "CWE-120"}]}], "descriptions": [{"lang": "en", "value": "A buffer overflow vulnerability in the UPnP AddPortMapping() command in Zyxel VMG4005-B50B firmware versions through 5.13(ABRL.5.4)C0 could allow an adjacent attacker to trigger a temporary denial-of-service (DoS) condition affecting the UPnP function of the affected device."}], "lastModified": "2026-06-02T14:45:28.410", "sourceIdentifier": "security@zyxel.com.tw"}