How severe is CVE-2021-45556?

CVE-2021-45556 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.

Is CVE-2021-45556 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-2021-45556?

CVE-2021-45556 primarily affects Netgear Gs108tv2 Firmware. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45556?

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-2021-45556 published?

CVE-2021-45556 was published on 2021-12-26 and last updated on 2026-06-17.

CVE-2021-45556

CVE-2021-45556 is a high-severity vulnerability in Netgear Gs108tv2 Firmware with a CVSS 3.x base score of 7.5. 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 7.5)
CVSS v2: 6.5
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Netgear Gs108tv2 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 GS108Tv2 before 5.4.2.36, GS110TPP before 7.0.7.2, GS110TPv2 before 5.4.2.36., GS110TPv3 before 7.0.7.2, GS308T before 1.0.3.2, GS310TP before 1.0.3.2, GS724TPP before 2.0.6.3, GS724TPv2 before 2.0.6.3, GS728TPPv2 before 6.0.8.2, GS728TPv2 before 6.0.8.2, GS752TPP before 6.0.8.2, GS752TPv2 before 6.0.8.2, MS510TXM before 1.0.4.2, and MS510TXUP before 1.0.4.2.

Frequently asked questions

What is CVE-2021-45556?: Certain NETGEAR devices are affected by command injection by an authenticated user. This affects GS108Tv2 before 5.4.2.36, GS110TPP before 7.0.7.2, GS110TPv2 before 5.4.2.36., GS110TPv3 before 7.0.7.2, GS308T before 1.0.3.2, GS310TP before 1.0.3.2, GS724TPP before 2.0.6.3, GS724TPv2 before 2.0.6.3, GS728TPPv2 before 6.0.8.2, GS728TPv2 before 6.0.8.2, GS752TPP before 6.0.8.2, GS752TPv2 before 6.0.8.2, MS510TXM before 1.0.4.2, and MS510TXUP before 1.0.4.2.
How severe is CVE-2021-45556?: CVE-2021-45556 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability high.
Is CVE-2021-45556 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-2021-45556?: CVE-2021-45556 primarily affects Netgear Gs108tv2 Firmware. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45556?: 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-2021-45556 published?: CVE-2021-45556 was published on 2021-12-26 and last updated on 2026-06-17.

References

https://kb.netgear.com/000064534/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Smart-Managed-Pro-Switches-PSV-2021-0175

Affected products (14)

cpe:2.3:o:netgear:gs108tv2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs110tpp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs110tpv2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs308t_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs110tpv3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs310tp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs724tpp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs724tpv2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs728tppv2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs728tpv2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs752tpp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:gs752tpv2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ms510txm_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ms510txup_firmware:*:*:*:*:*:*:*:*

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