CVE-2020-13365
First published: Thu Aug 06 2020(Updated: )
Certain Zyxel products have a locally accessible binary that allows a non-root user to generate a password for an undocumented user account that can be used for a TELNET session as root. 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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Zyxel NAS326 firmware | <v5.21\(aazf.9\)c0 | |
| Zyxel NAS326 | ||
| Zyxel Nas520 Firmware | <v5.21\(aasz.5\)c0 | |
| Zyxel Nas520 | ||
| Zyxel Nas540 Firmware | <v5.21\(aatb.6\)c0 | |
| Zyxel Nas540 | ||
| Zyxel Nas542 Firmware | <v5.21\(abag.6\)c0 | |
| Zyxel NAS542 |
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Reference Links
Frequently Asked Questions
Which Zyxel products are affected by CVE-2020-13365?
Zyxel 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.
What is the severity of CVE-2020-13365?
The severity of CVE-2020-13365 is critical with a severity value of 8.8.
How can a non-root user generate a password for an undocumented user account on the affected Zyxel products?
A non-root user can generate a password for an undocumented user account using a locally accessible binary on the affected Zyxel products.
Can the generated password be used for a TELNET session as root?
Yes, the generated password can be used for a TELNET session as root.
Where can I find more information about CVE-2020-13365?
You can find more information about CVE-2020-13365 on the Zyxel security advisory and security advisories page.
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- agent/description
- agent/event
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- agent/softwarecombine
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- vendor/zyxel
- canonical/zyxel nas326 firmware
- canonical/zyxel nas326
- canonical/zyxel nas520 firmware
- canonical/zyxel nas520
- canonical/zyxel nas540 firmware
- canonical/zyxel nas540
- canonical/zyxel nas542 firmware
- canonical/zyxel nas542