Is CVE-2020-13364 in the CISA KEV catalog?

No. CVE-2020-13364 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-13364?

CVE-2020-13364 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2020-13364?

CVE-2020-13364 has an EPSS score of 1.15% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-13364?

Upgrade nas326 firmware to v5.21(aazf.9)c0 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2020-13364

HIGH

8.8

CVSS v3

NVD

Description

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.

How to fix

Remediation Available

nas326 firmwareNVD

Affected:< v5.21(aazf.9)c0Fixed in:v5.21(aazf.9)c0CVE-2020-13364derived from NVD

nas520 firmwareNVD

Affected:< v5.21(aasz.5)c0Fixed in:v5.21(aasz.5)c0CVE-2020-13364derived from NVD

nas540 firmwareNVD

Affected:< v5.21(aatb.6)c0Fixed in:v5.21(aatb.6)c0CVE-2020-13364derived from NVD

nas542 firmwareNVD

Affected:< v5.21(abag.6)c0Fixed in:v5.21(abag.6)c0CVE-2020-13364derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.15%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Vendor Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.