How severe is CVE-2021-42877?

CVE-2021-42877 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-42877 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42877?

CVE-2021-42877 affects Totolink Ex1200t Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42877?

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-2021-42877 published?

CVE-2021-42877 was published on 2022-06-02 and last updated on 2026-07-05.

CVE-2021-42877

CVE-2021-42877 is a high-severity vulnerability in Totolink Ex1200t 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Totolink Ex1200t Firmware
Published: 2022-06-02
Last modified: 2026-07-05

Description

TOTOLINK EX1200T V4.1.2cu.5215 contains a denial of service vulnerability in function RebootSystem of the file lib/cste_modules/system which can reboot the system.

Frequently asked questions

What is CVE-2021-42877?: TOTOLINK EX1200T V4.1.2cu.5215 contains a denial of service vulnerability in function RebootSystem of the file lib/cste_modules/system which can reboot the system.
How severe is CVE-2021-42877?: CVE-2021-42877 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-42877 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42877?: CVE-2021-42877 affects Totolink Ex1200t Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42877?: 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-2021-42877 published?: CVE-2021-42877 was published on 2022-06-02 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:o:totolink:ex1200t_firmware:4.1.2cu.5215:*:*:*:*:*:*:*

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CVE-2025-28039 — Critical (CVSS 9.8): TOTOLINK EX1200T V4.1.2cu.5232_B20210713 was found to contain a pre-auth remote command execution vulnerability in the…
CVE-2025-28038 — Critical (CVSS 9.8): TOTOLINK EX1200T V4.1.2cu.5232_B20210713 was found to contain a pre-auth remote command execution vulnerability in the…
CVE-2023-52032 — Critical (CVSS 9.8): TOTOlink EX1200T V4.1.2cu.5232_B20210713 was discovered to contain a remote command execution (RCE) vulnerability via…
CVE-2021-42890 — Critical (CVSS 9.8): TOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection vulnerability in function NTPSyncWithHost of the…

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