How severe is CVE-2021-46901?

CVE-2021-46901 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-2021-46901 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-46901?

CVE-2021-46901 affects Cetic Cetic-6lbr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-46901?

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-2021-46901 published?

CVE-2021-46901 was published on 2023-12-31 and last updated on 2026-06-17.

CVE-2021-46901

CVE-2021-46901 is a high-severity vulnerability in Cetic Cetic-6lbr 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Cetic Cetic-6lbr
Published: 2023-12-31
Last modified: 2026-06-17

Description

examples/6lbr/apps/6lbr-webserver/httpd.c in CETIC-6LBR (aka 6lbr) 1.5.0 has a strcat stack-based buffer overflow via a request for a long URL over a 6LoWPAN network.

Frequently asked questions

What is CVE-2021-46901?: examples/6lbr/apps/6lbr-webserver/httpd.c in CETIC-6LBR (aka 6lbr) 1.5.0 has a strcat stack-based buffer overflow via a request for a long URL over a 6LoWPAN network.
How severe is CVE-2021-46901?: CVE-2021-46901 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-2021-46901 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-46901?: CVE-2021-46901 affects Cetic Cetic-6lbr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-46901?: 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-2021-46901 published?: CVE-2021-46901 was published on 2023-12-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:cetic:cetic-6lbr:1.5.0:*:*:*:*:*:*:*

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