How severe is CVE-2021-45607?

CVE-2021-45607 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-45607 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45607?

CVE-2021-45607 primarily affects Netgear R6400v2 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45607?

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

When was CVE-2021-45607 published?

CVE-2021-45607 was published on 2021-12-26 and last updated on 2026-06-17.

CVE-2021-45607

CVE-2021-45607 is a medium-severity vulnerability in Netgear R6400v2 Firmware with a CVSS 3.x base score of 6.8. 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: Medium (CVSS 3.x base score 6.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Netgear R6400v2 Firmware
Published: 2021-12-26
Last modified: 2026-06-17

Description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects R6400v2 before 1.0.4.118, R6700v3 before 1.0.4.118, R6900P before 1.3.3.140, R7000 before 1.0.11.126, R7000P before 1.3.3.140, RAX200 before 1.0.5.126, RAX75 before 1.0.5.126, and RAX80 before 1.0.5.126.

Frequently asked questions

What is CVE-2021-45607?: Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects R6400v2 before 1.0.4.118, R6700v3 before 1.0.4.118, R6900P before 1.3.3.140, R7000 before 1.0.11.126, R7000P before 1.3.3.140, RAX200 before 1.0.5.126, RAX75 before 1.0.5.126, and RAX80 before 1.0.5.126.
How severe is CVE-2021-45607?: CVE-2021-45607 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-45607 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45607?: CVE-2021-45607 primarily affects Netgear R6400v2 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45607?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-45607 published?: CVE-2021-45607 was published on 2021-12-26 and last updated on 2026-06-17.

References

https://kb.netgear.com/000064531/Security-Advisory-for-Post-Authentication-Stack-Overflow-on-Some-Routers-PSV-2021-0128

Affected products (8)

cpe:2.3:o:netgear:r6400v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6700v3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r6900p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7000p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rax200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rax75_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rax80_firmware:*:*:*:*:*:*:*:*

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