How severe is CVE-2026-5020?

CVE-2026-5020 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-5020 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5020?

CVE-2026-5020 affects Totolink A3600r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5020?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5020 have an EU (EUVD) identifier?

Yes. CVE-2026-5020 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16961.

When was CVE-2026-5020 published?

CVE-2026-5020 was published on 2026-03-29 and last updated on 2026-06-17.

CVE-2026-5020

CVE-2026-5020 is a medium-severity vulnerability in Totolink A3600r Firmware with a CVSS 3.x base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 2.1
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16961
Weakness: CWE-77
Affected product: Totolink A3600r Firmware
Published: 2026-03-29
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-5020?: 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.
How severe is CVE-2026-5020?: CVE-2026-5020 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-5020 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5020?: CVE-2026-5020 affects Totolink A3600r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5020?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5020 have an EU (EUVD) identifier?: Yes. CVE-2026-5020 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16961.
When was CVE-2026-5020 published?: CVE-2026-5020 was published on 2026-03-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:a3600r_firmware:4.1.2cu.5182_b20201102:*:*:*:*:*:*:*

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