MEDIUM
CVE-2020-29379
CWE-306Published: November 29, 2020· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official 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.
Technical Analysis
CVE-2020-29379 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Affected Vendors & Products
vsolcn4 product(s)
v1600d4l firmwarev1600d4lv1600d-mini firmwarev1600d-mini
Source: NVD CPE · 4 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
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GitHub PoC Search
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Rapid7 / Metasploit
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PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (2)
→
https://seclists.org/fulldisclosure/2020/Jul/14Exploit · Mailing List · Third Party Advisory
→
https://seclists.org/fulldisclosure/2020/Jul/14Exploit · Mailing List · Third Party Advisory
Quick Facts
CVE IDCVE-2020-29379
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-306
CISA KEVNo
Affected1 vendor(s)
PublishedNov 29, 2020
Related CVEs (CWE-306)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-29379 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.