CVE-2021-45515

Certain NETGEAR devices are affected by denial of service. This affects EX7500 before 1.0.0.72, RBS40V before 2.6.1.4, RBW30 before 2.6.1.4, RBRE960 before 6.0.3.68, RBSE960 before 6.0.3.68, RBR750 before 3.2.17.12, RBR850 before 3.2.17.12, RBS750 before 3.2.17.12, RBS850 before 3.2.17.12, RBK752 before 3.2.17.12, and RBK852 before 3.2.17.12.

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-2021-45515 is rated Low Risk (38.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.44%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2021-45515

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 0.05% 0.44% +0.39%
2 2025-03-24 0.04% 0.05% +0.02%
3 2025-03-17 — 0.04% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45515

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
No account or special rights needed—anonymous or random user is enough.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
No account or special rights needed—anonymous or random user is enough.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
3.3 2.0 LOW
AV:A/AC:L/Au:N/C:N/I:N/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:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.5 2.9 [email protected]

Weakness enumeration for CVE-2021-45515

Affected software / configurations for CVE-2021-45515

Vendor Product Version Raw CPE
netgear ex7500_firmware < 1.0.0.72 cpe:2.3:o:netgear:ex7500_firmware:*:*:*:*:*:*:*:*
netgear rbs40v_firmware < 2.6.1.4 cpe:2.3:o:netgear:rbs40v_firmware:*:*:*:*:*:*:*:*
netgear rbw30_firmware < 2.6.1.4 cpe:2.3:o:netgear:rbw30_firmware:*:*:*:*:*:*:*:*
netgear rbke963_firmware < 6.0.3.68 cpe:2.3:o:netgear:rbke963_firmware:*:*:*:*:*:*:*:*
netgear rbre960_firmware < 6.0.3.68 cpe:2.3:o:netgear:rbre960_firmware:*:*:*:*:*:*:*:*
netgear rbse960_firmware < 6.0.3.68 cpe:2.3:o:netgear:rbse960_firmware:*:*:*:*:*:*:*:*
netgear rbr750_firmware < 3.2.17.12 cpe:2.3:o:netgear:rbr750_firmware:*:*:*:*:*:*:*:*
netgear rbr850_firmware < 3.2.17.12 cpe:2.3:o:netgear:rbr850_firmware:*:*:*:*:*:*:*:*
netgear rbs750_firmware < 3.2.17.12 cpe:2.3:o:netgear:rbs750_firmware:*:*:*:*:*:*:*:*
netgear rbs850_firmware < 3.2.17.12 cpe:2.3:o:netgear:rbs850_firmware:*:*:*:*:*:*:*:*
netgear rbk752_firmware < 3.2.17.12 cpe:2.3:o:netgear:rbk752_firmware:*:*:*:*:*:*:*:*
netgear rbk852_firmware < 3.2.17.12 cpe:2.3:o:netgear:rbk852_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-45515

cvelogic Threat Intelligence