How severe is CVE-2020-29138?

CVE-2020-29138 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2020-29138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-29138?

CVE-2020-29138 affects Sagemcom F@st 3486 Router Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-29138?

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

When was CVE-2020-29138 published?

CVE-2020-29138 was published on 2020-11-27 and last updated on 2026-06-17.

CVE-2020-29138

CVE-2020-29138 is a medium-severity vulnerability in Sagemcom F@st 3486 Router Firmware with a CVSS 3.x base score of 5.3. 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-306.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-306
Affected product: Sagemcom F@st 3486 Router Firmware
Published: 2020-11-27
Last modified: 2026-06-17

Description

Incorrect Access Control in the configuration backup path in SAGEMCOM F@ST3486 NET DOCSIS 3.0, software NET_4.109.0, allows remote unauthenticated users to download the router configuration file via the /backupsettings.conf URI, when any valid session is running.

Frequently asked questions

What is CVE-2020-29138?: Incorrect Access Control in the configuration backup path in SAGEMCOM F@ST3486 NET DOCSIS 3.0, software NET_4.109.0, allows remote unauthenticated users to download the router configuration file via the /backupsettings.conf URI, when any valid session is running.
How severe is CVE-2020-29138?: CVE-2020-29138 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2020-29138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-29138?: CVE-2020-29138 affects Sagemcom F@st 3486 Router Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-29138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-29138 published?: CVE-2020-29138 was published on 2020-11-27 and last updated on 2026-06-17.

References

https://medium.com/%40alexandrevvo/improper-access-control-in-the-sagemcom-router-model-f-st3486-net-797968e8adc8

Affected products (1)

cpe:2.3:o:sagemcom:f\@st_3486_router_firmware:4.109.0:*:*:*:*:*:*:*

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