How severe is CVE-2021-45594?

CVE-2021-45594 has a CVSS 3.x base score of 8.4, rated high 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-2021-45594 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45594?

CVE-2021-45594 primarily affects Netgear Rbr20 Firmware. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45594?

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-2021-45594 published?

CVE-2021-45594 was published on 2021-12-26 and last updated on 2026-06-17.

CVE-2021-45594

CVE-2021-45594 is a high-severity vulnerability in Netgear Rbr20 Firmware with a CVSS 3.x base score of 8.4. 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-77.

Key facts

Severity: High (CVSS 3.x base score 8.4)
CVSS v2: 5.2
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Netgear Rbr20 Firmware
Published: 2021-12-26
Last modified: 2026-06-17

Description

Certain NETGEAR devices are affected by command injection by an authenticated user. This affects RBS50Y before 2.7.3.22, RBR20 before 2.7.3.22, RBR40 before 2.7.3.22, RBR50 before 2.7.3.22, RBS20 before 2.7.3.22, RBS40 before 2.7.3.22, RBS50 before 2.7.3.22, RBK20 before 2.7.3.22, RBK40 before 2.7.3.22, and RBK50 before 2.7.3.22.

Frequently asked questions

What is CVE-2021-45594?: Certain NETGEAR devices are affected by command injection by an authenticated user. This affects RBS50Y before 2.7.3.22, RBR20 before 2.7.3.22, RBR40 before 2.7.3.22, RBR50 before 2.7.3.22, RBS20 before 2.7.3.22, RBS40 before 2.7.3.22, RBS50 before 2.7.3.22, RBK20 before 2.7.3.22, RBK40 before 2.7.3.22, and RBK50 before 2.7.3.22.
How severe is CVE-2021-45594?: CVE-2021-45594 has a CVSS 3.x base score of 8.4, rated high 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-2021-45594 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45594?: CVE-2021-45594 primarily affects Netgear Rbr20 Firmware. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45594?: 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-2021-45594 published?: CVE-2021-45594 was published on 2021-12-26 and last updated on 2026-06-17.

References

https://kb.netgear.com/000064475/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-WiFi-Systems-PSV-2020-0183

Affected products (10)

cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs50y_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Netgear Rbr20 Firmware

CVE-2021-38516 — Critical (CVSS 10.0): Certain NETGEAR devices are affected by lack of access control at the function level. This affects D6220 before…
CVE-2021-29068 — Critical (CVSS 9.9): Certain NETGEAR devices are affected by a buffer overflow by an authenticated user. This affects R6700v3 before…
CVE-2020-35795 — Critical (CVSS 9.8): Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects AC2100 before…
CVE-2021-45626 — Critical (CVSS 9.6): Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects RBK20 before…
CVE-2021-45619 — Critical (CVSS 9.6): Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects EX6200v2 before…
CVE-2021-45618 — Critical (CVSS 9.6): Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects D7800 before…

All CVEs affecting Netgear Rbr20 Firmware →

Other CWE-77 (Command Injection) vulnerabilities

CVE-2026-23652 — Critical (CVSS 10.0): Improper neutralization of special elements used in a command ('command injection') in Microsoft Power Pages allows an…
CVE-2025-59818 — Critical (CVSS 10.0): This vulnerability allows authenticated attackers to execute arbitrary commands on the underlying system using the file…
CVE-2025-64093 — Critical (CVSS 10.0): Remote Code Execution vulnerability that allows unauthenticated attackers to inject arbitrary commands into the…
CVE-2025-64090 — Critical (CVSS 10.0): This vulnerability allows authenticated attackers to execute commands via the hostname of the device.
CVE-2025-61492 — Critical (CVSS 10.0): A command injection vulnerability in the execute_command function of terminal-controller-mcp 0.1.7 allows attackers to…
CVE-2025-10035 — Critical (CVSS 10.0): A deserialization vulnerability in the License Servlet of Fortra's GoAnywhere MFT allows an actor with a validly forged…

Browse all CWE-77 (Command Injection) vulnerabilities →