CVE-2023-31728: Teltonika RUT240 devices with firmware before 07.04.2, when bridge mode is used, sometimes make SSH and HTTP s

Q: How do I fix CVE-2023-31728?

rut240 firmware: upgrade to 00.07.04.2. Exact commands for each OS are on this page.

Q: Is CVE-2023-31728 being exploited?

CVE-2023-31728 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-2023-31728 affect?

CVE-2023-31728 affects rut240 firmware. Severity is high (CVSS 7.0). Teltonika RUT240 devices with firmware before 07.04.2, when bridge mode is used, sometimes make SSH and HTTP services available on the IPv6 WAN interface even though the UI shows that they are only available on the LAN interface.

Routine

HIGH 7.0UPGRADE

CVE-2023-31728 is a high-severity flaw (CVSS 7.0) affecting rut240 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Teltonika RUT240 devices with firmware before 07.04.2, when bridge mode is used, sometimes make SSH and HTTP services available on the IPv6 WAN interface even though the UI shows that they are only available on the LAN interface.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.0 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Published	2024-02-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: teltonika-networks

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

Am I affected?

Timeline

2024-02-17 04:15 UTCPublished CVE record published
2026-06-17 05:57 UTCUpdated Record last modified

teltonika-networks rut240 firmware UPGRADE

Affected: < 00.07.04.2

Fixed in: 00.07.04.2

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-2023-31728?

rut240 firmware: upgrade to 00.07.04.2. Exact commands for each OS are on this page.

Is CVE-2023-31728 being exploited?

CVE-2023-31728 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-2023-31728 affect?

CVE-2023-31728 affects rut240 firmware. Severity is high (CVSS 7.0). Teltonika RUT240 devices with firmware before 07.04.2, when bridge mode is used, sometimes make SSH and HTTP services available on the IPv6 WAN interface even though the UI shows that they are only available on the LAN interface.

How urgent is CVE-2023-31728?

Priority 27/100. High severity

Related CVEs

CVE-2023-32350 HIGH 8.0 UPGRADE UPGRADE Versions 00.07.00 through 00.07.03 of Teltonika’s RUT router firmware contain an operating system (OS) comman
CVE-2023-32349 HIGH 8.0 UPGRADE UPGRADE Version 00.07.03.4 and prior of Teltonika’s RUT router firmware contain a packet dump utility that contains p

References

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