Vulnerability Intelligence Report
CVE-2020-13364
A backdoor in certain Zyxel products allows remote TELNET access via a CGI script. This affects NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0, V5.11(AASZ.3)C0, and V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, and V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 and V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 and 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, and V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 and V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; and NAS540 V5.21(AATB.5)C0 and V5.21(AATB.3)C0.
No Active Exploit Signals
CVSS Base Score
6.5
MEDIUM
Exploitability:3.9
Impact Score:2.6
EPSS Probability:1.15%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
—
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| zyxel | nas326_firmware | all |
| zyxel | nas326 | all |
| zyxel | nas520_firmware | all |
| zyxel | nas520 | all |
| zyxel | nas540_firmware | all |
| zyxel | nas540 | all |
| zyxel | nas542_firmware | all |
| zyxel | nas542 | all |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
1.151%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | MITRE Corporation · N/A · USA |
| Reserved | 2020-05-21T00:00:00 |
| Published | 2020-08-06T16:54:43 |
| Last Updated | 2024-08-04T12:18:18 |
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