How severe is CVE-2020-28373?

CVE-2020-28373 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-2020-28373 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-2020-28373?

CVE-2020-28373 primarily affects Netgear R6400v2 Firmware. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-28373?

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-2020-28373 published?

CVE-2020-28373 was published on 2020-11-09 and last updated on 2026-06-17.

CVE-2020-28373

CVE-2020-28373 is a high-severity vulnerability in Netgear R6400v2 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 8.3
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Netgear R6400v2 Firmware
Published: 2020-11-09
Last modified: 2026-06-17

Description

upnpd on certain NETGEAR devices allows remote (LAN) attackers to execute arbitrary code via a stack-based buffer overflow. This affects R6400v2 V1.0.4.102_10.0.75, R6400 V1.0.1.62_1.0.41, R7000P V1.3.2.126_10.1.66, XR300 V1.0.3.50_10.3.36, R8000 V1.0.4.62, R8300 V1.0.2.136, R8500 V1.0.2.136, R7300DST V1.0.0.74, R7850 V1.0.5.64, R7900 V1.0.4.30, RAX20 V1.0.2.64, RAX80 V1.0.3.102, and R6250 V1.0.4.44.

Frequently asked questions

What is CVE-2020-28373?: upnpd on certain NETGEAR devices allows remote (LAN) attackers to execute arbitrary code via a stack-based buffer overflow. This affects R6400v2 V1.0.4.102_10.0.75, R6400 V1.0.1.62_1.0.41, R7000P V1.3.2.126_10.1.66, XR300 V1.0.3.50_10.3.36, R8000 V1.0.4.62, R8300 V1.0.2.136, R8500 V1.0.2.136, R7300DST V1.0.0.74, R7850 V1.0.5.64, R7900 V1.0.4.30, RAX20 V1.0.2.64, RAX80 V1.0.3.102, and R6250 V1.0.4.44.
How severe is CVE-2020-28373?: CVE-2020-28373 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-2020-28373 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-2020-28373?: CVE-2020-28373 primarily affects Netgear R6400v2 Firmware. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-28373?: 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-2020-28373 published?: CVE-2020-28373 was published on 2020-11-09 and last updated on 2026-06-17.

References

https://github.com/cpeggg/Netgear-upnpd-poc

Affected products (13)

cpe:2.3:o:netgear:r6400v2_firmware:1.0.4.102_10.0.75:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6400_firmware:1.0.1.62_1.0.41:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7000p_firmware:1.3.2.126_10.1.66:*:*:*:*:*:*:*
cpe:2.3:o:netgear:xr300_firmware:1.0.3.50_10.3.36:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r8000_firmware:1.0.4.62:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r8300_firmware:1.0.2.136:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r8500_firmware:1.0.2.136:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7300dst_firmware:1.0.0.74:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7850_firmware:1.0.5.64:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7900_firmware:1.0.4.30:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rax20_firmware:1.0.2.64:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rax80_firmware:1.0.3.102:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6250_firmware:1.0.4.44:*:*:*:*:*:*:*

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