CVE-2025-28138: The TOTOLINK A800R V4.1.2cu.5137_B20200730 were found to contain a pre-auth remote command execution vulnerabi

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CRITICAL 9.8REMOTEMITIGATE

CVE-2025-28138 is a critical-severity flaw (CVSS 9.8) affecting a800r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The TOTOLINK A800R V4.1.2cu.5137_B20200730 were found to contain a pre-auth remote command execution vulnerability in the setNoticeCfg function through the NoticeUrl parameter.

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	1.1% (top 33%)
CISA exploited list	No
Weakness	CWE-78
Published	2025-03-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: totolink

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

Am I affected?

Timeline

2025-03-27 16:15 UTCPublished CVE record published
2026-06-17 09:04 UTCUpdated Record last modified

totolink a800r firmware MITIGATE

Affected: 4.1.2cu.5137_b20200730

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1.2cu.5137_b20200730

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-2025-28138?

a800r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-28138 being exploited?

CVE-2025-28138 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-2025-28138 affect?

CVE-2025-28138 affects a800r firmware. Severity is critical (CVSS 9.8). The TOTOLINK A800R V4.1.2cu.5137_B20200730 were found to contain a pre-auth remote command execution vulnerability in the setNoticeCfg function through the NoticeUrl parameter.

How urgent is CVE-2025-28138?

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

Related CVEs

CVE-2025-4496 HIGH 8.8 MITIGATE MITIGATE A vulnerability was found in TOTOLINK T10, A3100R, A950RG, A800R, N600R, A3000RU and A810R 4.1.8cu.5241_B20210
CVE-2025-28136 MEDIUM 6.5 MITIGATE TOTOLINK A800R V4.1.2cu.5137_B20200730 was found to contain a buffer overflow vulnerability in the downloadFil
CVE-2025-28036 CRITICAL 9.8 MITIGATE MITIGATE TOTOLINK A950RG V4.1.2cu.5161_B20200903 was found to contain a pre-auth remote command execution vulnerability
CVE-2025-28035 CRITICAL 9.8 MITIGATE MITIGATE TOTOLINK A830R V4.1.2cu.5182_B20201102 was found to contain a pre-auth remote command execution vulnerability
CVE-2025-28034 CRITICAL 9.8 MITIGATE MITIGATE TOTOLINK A800R V4.1.2cu.5137_B20200730, A810R V4.1.2cu.5182_B20201026, A830R V4.1.2cu.5182_B20201102, A950RG V

References

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