CVE-2020-29376: An issue was discovered on V-SOL V1600D V2.03.69 and V2.03.57, V1600D4L V1.01.49, V1600D-MINI V1.01.48, V1600G

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CRITICAL 9.8REMOTEMITIGATEMITIGATEMITIGATE

CVE-2020-29376 is a critical-severity flaw (CVSS 9.8) affecting v1600d firmware, v1600d4l firmware, v1600d-mini firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-798
Published	2020-11-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: vsolcn

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-11-29 01:15 UTCPublished CVE record published
2026-06-17 03:11 UTCUpdated Record last modified

vsolcn v1600d firmware MITIGATE

Affected: 2.03.57 · 2.03.69

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.03.57

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

vsolcn v1600d4l firmware MITIGATE

Affected: 1.01.49

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.01.49

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

vsolcn v1600d-mini firmware MITIGATE

Affected: 1.01.48

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.01.48

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

vsolcn v1600g1 firmware MITIGATE

Affected: 1.9.7 · 2.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.9.7

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

vsolcn v1600g2 firmware MITIGATE

Affected: 1.1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.4

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-29376?

v1600d firmware: mitigate or apply the listed mitigation; v1600d4l firmware: mitigate or apply the listed mitigation; v1600d-mini firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-29376 being exploited?

CVE-2020-29376 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-29376 affect?

CVE-2020-29376 affects v1600d firmware, v1600d4l firmware, v1600d-mini firmware. Severity is critical (CVSS 9.8). 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 authenticat

How urgent is CVE-2020-29376?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-29382 HIGH 7.8 MITIGATE MITIGATE An issue was discovered on V-SOL V1600D V2.03.69 and V2.03.57, V1600G1 V2.0.7 and V1.9.7, and V1600G2 V1.1.4 O
CVE-2020-29381 CRITICAL 9.8 MITIGATE MITIGATE An issue was discovered on V-SOL V1600D V2.03.69 and V2.03.57, V1600D4L V1.01.49, V1600D-MINI V1.01.48, V1600G
CVE-2020-29380 MEDIUM 5.9 MITIGATE MITIGATE An issue was discovered on V-SOL V1600D V2.03.69 and V2.03.57, V1600D4L V1.01.49, V1600D-MINI V1.01.48, V1600G
CVE-2020-29378 HIGH 8.8 MITIGATE MITIGATE An issue was discovered on V-SOL V1600D V2.03.69 and V2.03.57, V1600D4L V1.01.49, V1600D-MINI V1.01.48, V1600G
CVE-2020-29377 CRITICAL 9.8 MITIGATE An issue was discovered on V-SOL V1600D V2.03.69 OLT devices

References

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