CVE-2026-5030: A vulnerability has been found in Totolink NR1800X 9.1.0u.6279_B20210910

This month

MEDIUM 6.3MITIGATE

CVE-2026-5030 is a medium-severity flaw (CVSS 6.3) affecting nr1800x firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability has been found in Totolink NR1800X 9.1.0u.6279_B20210910. This issue affects the function NTPSyncWithHost of the file /cgi-bin/cstecgi.cgi of the component Telnet Service. The manipulation of the argument host_time leads to command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-74, CWE-77
Published	2026-03-29
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: totolink

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

Am I affected?

Timeline

2026-03-29 05:15 UTCPublished CVE record published
2026-06-17 10:58 UTCUpdated Record last modified

totolink nr1800x firmware MITIGATE

Affected: 9.1.0u.6279_b20210910

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.1.0u.6279_b20210910

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-2026-5030?

nr1800x firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-5030 being exploited?

CVE-2026-5030 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-2026-5030 affect?

CVE-2026-5030 affects nr1800x firmware. Severity is medium (CVSS 6.3). A vulnerability has been found in Totolink NR1800X 9.1.0u.6279_B20210910. This issue affects the function NTPSyncWithHost of the file /cgi-bin/cstecgi.cgi of the component Telnet Service. The manipulation of the argument host_time leads to

How urgent is CVE-2026-5030?

Priority 48/100. Public exploit reference

Related CVEs

CVE-2026-1328 HIGH 8.8 MITIGATE A vulnerability was detected in Totolink NR1800X 9.1.0u.6279_B20210910
CVE-2026-1327 MEDIUM 6.3 MITIGATE A security vulnerability has been detected in Totolink NR1800X 9.1.0u.6279_B20210910
CVE-2026-1326 MEDIUM 6.3 MITIGATE A weakness has been identified in Totolink NR1800X 9.1.0u.6279_B20210910

References

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