How severe is CVE-2021-46559?

CVE-2021-46559 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 high, and availability none.

Is CVE-2021-46559 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-46559?

CVE-2021-46559 affects Moxa Tn-5900 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-46559?

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-2021-46559 published?

CVE-2021-46559 was published on 2022-01-26 and last updated on 2026-06-17.

CVE-2021-46559

CVE-2021-46559 is a high-severity vulnerability in Moxa Tn-5900 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-345.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-345
Affected product: Moxa Tn-5900 Firmware
Published: 2022-01-26
Last modified: 2026-06-17

Description

The firmware on Moxa TN-5900 devices through 3.1 has a weak algorithm that allows an attacker to defeat an inspection mechanism for integrity protection.

Frequently asked questions

What is CVE-2021-46559?: The firmware on Moxa TN-5900 devices through 3.1 has a weak algorithm that allows an attacker to defeat an inspection mechanism for integrity protection.
How severe is CVE-2021-46559?: CVE-2021-46559 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 high, and availability none.
Is CVE-2021-46559 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-46559?: CVE-2021-46559 affects Moxa Tn-5900 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-46559?: 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-2021-46559 published?: CVE-2021-46559 was published on 2022-01-26 and last updated on 2026-06-17.

References

https://www.moxa.com/en/support/product-support/security-advisory/tn-5900-secure-routers-vulnerabilities

Affected products (1)

cpe:2.3:o:moxa:tn-5900_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Moxa Tn-5900 Firmware

CVE-2021-46560 — Critical (CVSS 9.8): The firmware on Moxa TN-5900 devices through 3.1 allows command injection that could lead to device damage.
CVE-2023-34213 — High (CVSS 8.8): TN-5900 Series firmware versions v3.3 and prior are vulnerable to command-injection vulnerability. This vulnerability…
CVE-2023-33239 — High (CVSS 8.8): TN-4900 Series firmware versions v1.2.4 and prior and TN-5900 Series firmware versions v3.3 and prior are vulnerable to…
CVE-2023-33237 — High (CVSS 8.8): TN-5900 Series firmware version v3.3 and prior is vulnerable to improper-authentication vulnerability. This…
CVE-2023-34217 — High (CVSS 8.1): TN-4900 Series firmware versions v1.2.4 and prior and TN-5900 Series firmware versions v3.3 and prior are vulnerable to…
CVE-2023-34216 — High (CVSS 8.1): TN-4900 Series firmware versions v1.2.4 and prior and TN-5900 Series firmware versions v3.3 and prior are vulnerable to…

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