CVE-2025-28035: TOTOLINK A830R V4.1.2cu.5182_B20201102 was found to contain a pre-auth remote command execution vulnerability
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CRITICAL 9.8REMOTEMITIGATEMITIGATEMITIGATE
CVE-2025-28035 is a critical-severity flaw (CVSS 9.8) affecting a830r firmware, a3100r firmware, a810r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
TOTOLINK A830R V4.1.2cu.5182_B20201102 was 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.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
totolink a830r firmware MITIGATE
Affected: 4.1.2cu.5182_b20201102
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.1.2cu.5182_b20201102
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.
totolink a3100r firmware MITIGATE
Affected: 4.1.2cu.5247_b20211129
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.1.2cu.5247_b20211129
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.
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.
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.
totolink a3000ru firmware MITIGATE
Affected: 5.9c.5185_b20201128
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.9c.5185_b20201128
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.
totolink a950rg firmware MITIGATE
Affected: 4.1.2cu.5161_b20200903
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.1.2cu.5161_b20200903
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 sourceNVD · 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-2025-28035?
a830r firmware: mitigate or apply the listed mitigation; a3100r firmware: mitigate or apply the listed mitigation; a810r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2025-28035 being exploited?
CVE-2025-28035 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-2025-28035 affect?
CVE-2025-28035 affects a830r firmware, a3100r firmware, a810r firmware. Severity is critical (CVSS 9.8). TOTOLINK A830R V4.1.2cu.5182_B20201102 was found to contain a pre-auth remote command execution vulnerability in the setNoticeCfg function through the NoticeUrl parameter.
How urgent is CVE-2025-28035?
Priority 62/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action
Related CVEs
CVE-2025-28036CRITICAL 9.8MITIGATEMITIGATE TOTOLINK A950RG V4.1.2cu.5161_B20200903 was found to contain a pre-auth remote command execution vulnerability
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