CVE-2020-29380

An issue was discovered on V-SOL V1600D V2.03.69 and V2.03.57, V1600D4L V1.01.49, V1600D-MINI V1.01.48, V1600G1 V2.0.7 and V1.9.7, and V1600G2 V1.1.4 OLT devices. TELNET is offered by default but SSH is not always available. An attacker can intercept passwords sent in cleartext and conduct a man-in-the-middle attack on the management of the appliance.

Published: 2020-11-29 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-29380 is rated Low Risk (36.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.47%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-29380

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.13% 0.47% +0.34%
2 2023-03-07 0.89% 0.13% -0.75%
3 2022-04-01 — 0.89% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-29380

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-29380

Affected software / configurations for CVE-2020-29380

Vendor Product Version Raw CPE
vsolcn v1600d_firmware 2.03.57 cpe:2.3:o:vsolcn:v1600d_firmware:2.03.57:*:*:*:*:*:*:*
vsolcn v1600d_firmware 2.03.69 cpe:2.3:o:vsolcn:v1600d_firmware:2.03.69:*:*:*:*:*:*:*
vsolcn v1600d4l_firmware 1.01.49 cpe:2.3:o:vsolcn:v1600d4l_firmware:1.01.49:*:*:*:*:*:*:*
vsolcn v1600d-mini_firmware 1.01.48 cpe:2.3:o:vsolcn:v1600d-mini_firmware:1.01.48:*:*:*:*:*:*:*
vsolcn v1600g1_firmware 1.9.7 cpe:2.3:o:vsolcn:v1600g1_firmware:1.9.7:*:*:*:*:*:*:*
vsolcn v1600g1_firmware 2.0.7 cpe:2.3:o:vsolcn:v1600g1_firmware:2.0.7:*:*:*:*:*:*:*
vsolcn v1600g2_firmware 1.1.4 cpe:2.3:o:vsolcn:v1600g2_firmware:1.1.4:*:*:*:*:*:*:*

References for CVE-2020-29380

URL Tags
https://seclists.org/fulldisclosure/2020/Jul/14 Mailing List Third Party Advisory
cvelogic Threat Intelligence