How severe is CVE-2020-5635?

CVE-2020-5635 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-5635 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5635?

CVE-2020-5635 affects Necplatforms Aterm Sa3500g Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5635?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-5635 published?

CVE-2020-5635 was published on 2020-12-14 and last updated on 2026-06-17.

CVE-2020-5635

CVE-2020-5635 is a high-severity vulnerability in Necplatforms Aterm Sa3500g Firmware with a CVSS 3.x base score of 8.8. 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-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Necplatforms Aterm Sa3500g Firmware
Published: 2020-12-14
Last modified: 2026-06-17

Description

Aterm SA3500G firmware versions prior to Ver. 3.5.9 allows an attacker on the adjacent network to send a specially crafted request to a specific URL, which may result in an arbitrary command execution.

Frequently asked questions

What is CVE-2020-5635?: Aterm SA3500G firmware versions prior to Ver. 3.5.9 allows an attacker on the adjacent network to send a specially crafted request to a specific URL, which may result in an arbitrary command execution.
How severe is CVE-2020-5635?: CVE-2020-5635 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-5635 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5635?: CVE-2020-5635 affects Necplatforms Aterm Sa3500g Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5635?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-5635 published?: CVE-2020-5635 was published on 2020-12-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:necplatforms:aterm_sa3500g_firmware:*:*:*:*:*:*:*:*

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CVE-2020-5637 — Medium (CVSS 6.8): Improper validation of integrity check value vulnerability in Aterm SA3500G firmware versions prior to Ver. 3.5.9…
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