CVE-2020-25749: The Telnet service of Rubetek cameras RV-3406, RV-3409, and RV-3411 cameras (firmware versions v342, v339) cou

This week

CRITICAL 9.8REMOTEMITIGATEMITIGATEMITIGATE

CVE-2020-25749 is a critical-severity flaw (CVSS 9.8) affecting rv-3406 firmware, rv-3409 firmware, rv-3411 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Telnet service of Rubetek cameras RV-3406, RV-3409, and RV-3411 cameras (firmware versions v342, v339) could allow an remote attacker to take full control of the device with a high-privileged account. The vulnerability exists because a system account has a default and static password. The Telnet service cannot be disabled and this password cannot be changed via standard functionality.

Why this priority

Critical severity
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	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-798
Published	2020-09-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rubetek

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

Am I affected?

Timeline

2020-09-25 04:23 UTCPublished CVE record published
2026-06-17 03:07 UTCUpdated Record last modified

rubetek rv-3406 firmware MITIGATE

Affected: 339 · 342

Fixed in: no fixed release known

Safe to downgrade to: a release before 339

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.

rubetek rv-3409 firmware MITIGATE

Affected: 339 · 342

Fixed in: no fixed release known

Safe to downgrade to: a release before 339

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.

rubetek rv-3411 firmware MITIGATE

Affected: 339 · 342

Fixed in: no fixed release known

Safe to downgrade to: a release before 339

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-2020-25749?

rv-3406 firmware: mitigate or apply the listed mitigation; rv-3409 firmware: mitigate or apply the listed mitigation; rv-3411 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-25749 being exploited?

CVE-2020-25749 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-2020-25749 affect?

CVE-2020-25749 affects rv-3406 firmware, rv-3409 firmware, rv-3411 firmware. Severity is critical (CVSS 9.8). The Telnet service of Rubetek cameras RV-3406, RV-3409, and RV-3411 cameras (firmware versions v342, v339) could allow an remote attacker to take full control of the device with a high-privileged account. The vulnerability exists because a

How urgent is CVE-2020-25749?

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

Related CVEs

CVE-2020-25748 HIGH 8.1 MITIGATE MITIGATE A Cleartext Transmission issue was discovered on Rubetek RV-3406, RV-3409, and RV-3411 cameras (firmware versi
CVE-2020-25747 CRITICAL 9.4 MITIGATE MITIGATE The Telnet service of Rubetek RV-3406, RV-3409, and RV-3411 cameras (firmware versions v342, v339) can allow a

References

← Back to latest CVEs