CVE-2019-3950: Arlo Basestation firmware 1.12.0.1_27940 and prior contain a hardcoded username and password combination that

Q: How do I fix CVE-2019-3950?

vmb3010 firmware: upgrade to 1.12.2.3_2762; vmb4000 firmware: upgrade to 1.12.2.3_2762; vmb3500 firmware: upgrade to 1.12.2.4_2773. Exact commands for each OS are on this page.

Q: Is CVE-2019-3950 being exploited?

CVE-2019-3950 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-3950 affect?

CVE-2019-3950 affects vmb3010 firmware, vmb4000 firmware, vmb3500 firmware. Severity is critical (CVSS 9.8). Arlo Basestation firmware 1.12.0.1_27940 and prior contain a hardcoded username and password combination that allows root access to the device when an onboard serial interface is connected to.

Q: How urgent is CVE-2019-3950?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE

CVE-2019-3950 is a critical-severity flaw (CVSS 9.8) affecting vmb3010 firmware, vmb4000 firmware, vmb3500 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Arlo Basestation firmware 1.12.0.1_27940 and prior contain a hardcoded username and password combination that allows root access to the device when an onboard serial interface is connected to.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-798
Published	2019-07-09
Last modified	2026-06-17

Publisher (CNA): Tenable Network Security, Inc. · Vendor: arlo

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

Am I affected?

Timeline

2019-07-09 18:15 UTCPublished CVE record published
2026-06-17 02:35 UTCUpdated Record last modified

arlo vmb3010 firmware UPGRADE

Affected: < 1.12.2.3_2762

Fixed in: 1.12.2.3_2762

Safe to downgrade to: no unaffected older release

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.

arlo vmb4000 firmware UPGRADE

Affected: < 1.12.2.3_2762

Fixed in: 1.12.2.3_2762

Safe to downgrade to: no unaffected older release

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.

arlo vmb3500 firmware UPGRADE

Affected: < 1.12.2.4_2773

Fixed in: 1.12.2.4_2773

Safe to downgrade to: no unaffected older release

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.

arlo vmb4500 firmware UPGRADE

Affected: < 1.12.2.4_2773

Fixed in: 1.12.2.4_2773

Safe to downgrade to: no unaffected older release

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.

arlo vmb5000 firmware UPGRADE

Affected: < 1.12.2.2_2824

Fixed in: 1.12.2.2_2824

Safe to downgrade to: no unaffected older release

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-2019-3950?

vmb3010 firmware: upgrade to 1.12.2.3_2762; vmb4000 firmware: upgrade to 1.12.2.3_2762; vmb3500 firmware: upgrade to 1.12.2.4_2773. Exact commands for each OS are on this page.

Is CVE-2019-3950 being exploited?

CVE-2019-3950 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-2019-3950 affect?

CVE-2019-3950 affects vmb3010 firmware, vmb4000 firmware, vmb3500 firmware. Severity is critical (CVSS 9.8). Arlo Basestation firmware 1.12.0.1_27940 and prior contain a hardcoded username and password combination that allows root access to the device when an onboard serial interface is connected to.

How urgent is CVE-2019-3950?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-3949 CRITICAL 9.8 UPGRADE UPGRADE Arlo Basestation firmware 1.12.0.1_27940 and prior firmware contain a networking misconfiguration that allows

References

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