How severe is CVE-2020-5524?

CVE-2020-5524 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-2020-5524 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5524?

CVE-2020-5524 primarily affects Nec Aterm Wg2600hs Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-5524?

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-2020-5524 published?

CVE-2020-5524 was published on 2020-02-21 and last updated on 2026-06-17.

CVE-2020-5524

CVE-2020-5524 is a high-severity vulnerability in Nec Aterm Wg2600hs 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: 8.3
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Nec Aterm Wg2600hs Firmware
Published: 2020-02-21
Last modified: 2026-06-17

Description

Aterm series (Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS firmware Ver1.3.2 and earlier) allows an attacker on the same network segment to execute arbitrary OS commands with root privileges via UPnP function.

Frequently asked questions

What is CVE-2020-5524?: Aterm series (Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS firmware Ver1.3.2 and earlier) allows an attacker on the same network segment to execute arbitrary OS commands with root privileges via UPnP function.
How severe is CVE-2020-5524?: CVE-2020-5524 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-2020-5524 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5524?: CVE-2020-5524 primarily affects Nec Aterm Wg2600hs Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-5524?: 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-2020-5524 published?: CVE-2020-5524 was published on 2020-02-21 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:nec:aterm_wg2600hs_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wf1200c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1200cr_firmware:*:*:*:*:*:*:*:*

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CVE-2026-4622 — Critical (CVSS 9.8): OS Command Injection vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to execute arbitrary OS…
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