CVE-2020-29376

Exp

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. There is an !j@l#y$z%x6x7q8c9z) password for the admin account to authenticate to the TELNET service.

Published: 2020-11-29 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-29376 is rated High Exploit Risk (74.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.40%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2020-29376

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-29376

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 2025-03-30 0.79% 0.40% -0.38%
2 2025-03-29 0.40% 0.79% +0.38%
3 2025-03-17 — 0.40% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-29376

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/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:L)
Exploitation conditions are straightforward and predictable.
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.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-29376

Affected software / configurations for CVE-2020-29376

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-2020-29376

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