How severe is CVE-2026-5178?

CVE-2026-5178 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-2026-5178 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-2026-5178?

CVE-2026-5178 affects Totolink A3300r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5178?

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

Does CVE-2026-5178 have an EU (EUVD) identifier?

Yes. CVE-2026-5178 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17309.

When was CVE-2026-5178 published?

CVE-2026-5178 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-5178

CVE-2026-5178 is a medium-severity vulnerability in Totolink A3300r 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-74.

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-2026-17309
Weakness: CWE-74
Affected product: Totolink A3300r Firmware
Published: 2026-03-31
Last modified: 2026-06-17

Description

A security vulnerability has been detected in Totolink A3300R 17.0.0cu.557_b20221024. Affected by this issue is the function setIptvCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument vlanPriLan3 leads to command injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used.

Frequently asked questions

What is CVE-2026-5178?: A security vulnerability has been detected in Totolink A3300R 17.0.0cu.557_b20221024. Affected by this issue is the function setIptvCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument vlanPriLan3 leads to command injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used.
How severe is CVE-2026-5178?: CVE-2026-5178 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-2026-5178 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-2026-5178?: CVE-2026-5178 affects Totolink A3300r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5178?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5178 have an EU (EUVD) identifier?: Yes. CVE-2026-5178 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17309.
When was CVE-2026-5178 published?: CVE-2026-5178 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:a3300r_firmware:17.0.0cu.557_b20221024:*:*:*:*:*:*:*

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