CVE-2025-28031: TOTOLINK A810R V4.1.2cu.5182_B20201026 was discovered to contain a hardcoded password for the telnet service i

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MEDIUM 6.5REMOTEMITIGATE

CVE-2025-28031 is a medium-severity flaw (CVSS 6.5) affecting a810r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

TOTOLINK A810R V4.1.2cu.5182_B20201026 was discovered to contain a hardcoded password for the telnet service in product.ini.

Why this priority

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	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-259
Published	2025-04-22
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

2025-04-22 16:15 UTCPublished CVE record published
2026-06-17 09:04 UTCUpdated Record last modified

totolink a810r firmware MITIGATE

Affected: 4.1.2cu.5182_b20201026

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.1.2cu.5182_b20201026

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-2025-28031?

a810r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-28031 being exploited?

CVE-2025-28031 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-2025-28031 affect?

CVE-2025-28031 affects a810r firmware. Severity is medium (CVSS 6.5). TOTOLINK A810R V4.1.2cu.5182_B20201026 was discovered to contain a hardcoded password for the telnet service in product.ini.

How urgent is CVE-2025-28031?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

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CVE-2025-28137 CRITICAL 9.8 MITIGATE The TOTOLINK A810R V4.1.2cu.5182_B20201026 were found to contain a pre-auth remote command execution vulnerabi
CVE-2025-28135 HIGH 7.5 MITIGATE TOTOLINK A810R V4.1.2cu.5182_B20201026 was found to contain a buffer overflow vulnerability in downloadFile.cg
CVE-2025-28037 CRITICAL 9.8 MITIGATE MITIGATE TOTOLINK A810R V4.1.2cu.5182_B20201026 and A950RG V4.1.2cu.5161_B20200903 were found to contain a pre-auth rem
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

References

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