CVE-2025-28256: An issue in TOTOLINK A3100R V4.1.2cu.5247_B20211129 allows a remote attacker to execute arbitrary code via the

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CRITICAL 9.8REMOTEMITIGATE

CVE-2025-28256 is a critical-severity flaw (CVSS 9.8) affecting a3100r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in TOTOLINK A3100R V4.1.2cu.5247_B20211129 allows a remote attacker to execute arbitrary code via the setWebWlanIdx of the file /lib/cste_modules/wireless.so.

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	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-78
Published	2025-03-28
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

2025-03-28 21:15 UTCPublished CVE record published
2026-06-17 09:04 UTCUpdated Record last modified

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.

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-2025-28256?

a3100r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-28256 being exploited?

CVE-2025-28256 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-2025-28256 affect?

CVE-2025-28256 affects a3100r firmware. Severity is critical (CVSS 9.8). An issue in TOTOLINK A3100R V4.1.2cu.5247_B20211129 allows a remote attacker to execute arbitrary code via the setWebWlanIdx of the file /lib/cste_modules/wireless.so.

How urgent is CVE-2025-28256?

Priority 60/100. 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-2025-45790 CRITICAL 9.8 MITIGATE TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow via the priority parameter in the setMacQos interf
CVE-2025-45789 CRITICAL 9.8 MITIGATE TOTOLINK A3100R V5.9c.1527 is vulnerable to buffer overflow via the urlKeyword parameter in setParentalRules.
CVE-2025-45788 CRITICAL 9.8 MITIGATE TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow via the comment parameter in setMacFilterRules.
CVE-2025-45787 CRITICAL 9.8 MITIGATE TOTOLINK A3100R V5.9c.1527 is vulnerable to Buffer Overflow viathe comment parameter in setIpPortFilterRules.

References

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