How severe is CVE-2026-5339?

CVE-2026-5339 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-5339 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5339?

CVE-2026-5339 affects Tenda G103 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5339?

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

Does CVE-2026-5339 have an EU (EUVD) identifier?

Yes. CVE-2026-5339 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18342.

When was CVE-2026-5339 published?

CVE-2026-5339 was published on 2026-04-02 and last updated on 2026-06-17.

CVE-2026-5339

CVE-2026-5339 is a medium-severity vulnerability in Tenda G103 Firmware with a CVSS 3.x base score of 4.7. 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 4.7)
CVSS v2: 5.8
CVSS v4: 2.0
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18342
Weakness: CWE-77
Affected product: Tenda G103 Firmware
Published: 2026-04-02
Last modified: 2026-06-17

Description

A vulnerability was detected in Tenda G103 1.0.0.5. The impacted element is the function action_set_net_settings of the file gpon.lua of the component Setting Handler. Performing a manipulation of the argument authLoid/authLoidPassword/authPassword/authSerialNo/authType/oltType/usVlanId/usVlanPriority results in command injection. It is possible to initiate the attack remotely. The exploit is now public and may be used.

Frequently asked questions

What is CVE-2026-5339?: A vulnerability was detected in Tenda G103 1.0.0.5. The impacted element is the function action_set_net_settings of the file gpon.lua of the component Setting Handler. Performing a manipulation of the argument authLoid/authLoidPassword/authPassword/authSerialNo/authType/oltType/usVlanId/usVlanPriority results in command injection. It is possible to initiate the attack remotely. The exploit is now public and may be used.
How severe is CVE-2026-5339?: CVE-2026-5339 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-5339 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5339?: CVE-2026-5339 affects Tenda G103 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5339?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5339 have an EU (EUVD) identifier?: Yes. CVE-2026-5339 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18342.
When was CVE-2026-5339 published?: CVE-2026-5339 was published on 2026-04-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:tenda:g103_firmware:1.0.0.5:*:*:*:*:*:*:*

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