CVE-2026-5020: A vulnerability was detected in Totolink A3600R 4.1.2cu.5182_B20201102

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MEDIUM 6.3MITIGATE

CVE-2026-5020 is a medium-severity flaw (CVSS 6.3) affecting a3600r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was detected in Totolink A3600R 4.1.2cu.5182_B20201102. Affected by this issue is the function setNoticeCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument NoticeUrl results in command injection. The attack may be launched remotely. The exploit is now 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 01:15 UTCPublished CVE record published
2026-06-17 10:58 UTCUpdated Record last modified

totolink a3600r 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.

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-2026-5020?

a3600r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-5020 being exploited?

CVE-2026-5020 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-2026-5020 affect?

CVE-2026-5020 affects a3600r firmware. Severity is medium (CVSS 6.3). A vulnerability was detected in Totolink A3600R 4.1.2cu.5182_B20201102. Affected by this issue is the function setNoticeCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument NoticeUrl resu

How urgent is CVE-2026-5020?

Priority 48/100. Public exploit reference

Related CVEs

CVE-2026-31027 CRITICAL 9.8 MITIGATE TOTOlink A3600R v5.9c.4959 contains a buffer overflow vulnerability in the setAppEasyWizardConfig interface of

References

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