CVE-2021-45593

Certain NETGEAR devices are affected by command injection by an authenticated user. This affects RBR20 before 2.7.3.22, RBR40 before 2.7.3.22, RBR50 before 2.7.2.102, RBS20 before 2.7.3.22, RBS40 before 2.7.3.22, RBR50 before 2.7.2.102, RBK20 before 2.7.3.22, RBK40 before 2.7.3.22, and RBK50 before 2.7.2.102.

Published: 2021-12-25 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-45593 is rated Moderate Risk (52.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.78%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-45593

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.10% 0.78% +0.68%
2 2026-01-02 0.18% 0.10% -0.08%
3 2025-11-21 — 0.18% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45593

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.4 3.1 HIGH
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.7 6.0 [email protected]
6.8 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.9 5.9 [email protected]
5.2 2.0 MEDIUM
AV:A/AC:L/Au:S/C:P/I:P/A:P Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 5.1 6.4 [email protected]

Weakness enumeration for CVE-2021-45593

Affected software / configurations for CVE-2021-45593

Vendor Product Version Raw CPE
netgear rbr20_firmware < 2.7.3.22 cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:*
netgear rbr40_firmware < 2.7.3.22 cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:*
netgear rbr50_firmware < 2.7.2.102 cpe:2.3:o:netgear:rbr50_firmware:*:*:*:*:*:*:*:*
netgear rbs20_firmware < 2.7.3.22 cpe:2.3:o:netgear:rbs20_firmware:*:*:*:*:*:*:*:*
netgear rbs40_firmware < 2.7.3.22 cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:*
netgear rbk20_firmware < 2.7.3.22 cpe:2.3:o:netgear:rbk20_firmware:*:*:*:*:*:*:*:*
netgear rbk40_firmware < 2.7.3.22 cpe:2.3:o:netgear:rbk40_firmware:*:*:*:*:*:*:*:*
netgear rbk50_firmware < 2.7.2.102 cpe:2.3:o:netgear:rbk50_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-45593

cvelogic Threat Intelligence