CVE-2018-20396: NET&SYS MNG2120J 5.76.1006c and MNG6300 5.83.6305jrc2 devices allow remote attackers to discover credentials v

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CRITICAL 9.8REMOTEMITIGATEMITIGATE

CVE-2018-20396 is a critical-severity flaw (CVSS 9.8) affecting ming2120j firmware, ming6300 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NET&SYS MNG2120J 5.76.1006c and MNG6300 5.83.6305jrc2 devices allow remote attackers to discover credentials via iso.3.6.1.4.1.4491.2.4.1.1.6.1.1.0 and iso.3.6.1.4.1.4491.2.4.1.1.6.1.2.0 SNMP requests.

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	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-522
Published	2018-12-23
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: telaum

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

Am I affected?

Timeline

2018-12-23 21:29 UTCPublished CVE record published
2026-06-17 01:52 UTCUpdated Record last modified

telaum ming2120j firmware MITIGATE

Affected: 5.76.1006c

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.76.1006c

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.

telaum ming6300 firmware MITIGATE

Affected: 5.83.6305jrc2

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.83.6305jrc2

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-2018-20396?

ming2120j firmware: mitigate or apply the listed mitigation; ming6300 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-20396 being exploited?

CVE-2018-20396 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-2018-20396 affect?

CVE-2018-20396 affects ming2120j firmware, ming6300 firmware. Severity is critical (CVSS 9.8). NET&SYS MNG2120J 5.76.1006c and MNG6300 5.83.6305jrc2 devices allow remote attackers to discover credentials via iso.3.6.1.4.1.4491.2.4.1.1.6.1.1.0 and iso.3.6.1.4.1.4491.2.4.1.1.6.1.2.0 SNMP requests.

How urgent is CVE-2018-20396?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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