CVE-2020-29379

Name: CVE-2020-29379
Creator: NVD / NIST
Published: 2020-11-29T01:15:11.083+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2020-29379 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An issue was discovered on V-SOL V1600D4L V1.01.49 and V1600D-MINI V1.01.48 OLT devices. During the process of updating the firmware, the update script starts a telnetd -l /bin/sh process that does not require authentication for TELNET access.. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

Description

An issue was discovered on V-SOL V1600D4L V1.01.49 and V1600D-MINI V1.01.48 OLT devices. During the process of updating the firmware, the update script starts a telnetd -l /bin/sh process that does not require authentication for TELNET access.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.32%

23.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-306

Affected Software

Vendor	Product	Versions
Vsolcn	V1600d4l Firmware	1.01.49
Vsolcn	V1600d-Mini Firmware	1.01.48

References

https://seclists.org/fulldisclosure/2020/Jul/14Exploit, Mailing List, Third Party Advisory
https://seclists.org/fulldisclosure/2020/Jul/14Exploit, Mailing List, Third Party Advisory

Timeline

Published: Nov 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-29379?

How severe is CVE-2020-29379?

CVE-2020-29379 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2020-29379?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-29379?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST