CVE-2020-25110
CVE-2020-25110 is a critical-severity vulnerability in Ethernut Nut/os with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 52% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 52% (99th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Ethernut Nut/os
- Published:
- Last modified:
Description
An issue was discovered in the DNS implementation in Ethernut in Nut/OS 5.1. The length byte of a domain name in a DNS query/response is not checked, and is used for internal memory operations. This may lead to successful Denial-of-Service, and possibly Remote Code Execution.
Frequently asked questions
- What is CVE-2020-25110?
- An issue was discovered in the DNS implementation in Ethernut in Nut/OS 5.1. The length byte of a domain name in a DNS query/response is not checked, and is used for internal memory operations. This may lead to successful Denial-of-Service, and possibly Remote Code Execution.
- How severe is CVE-2020-25110?
- CVE-2020-25110 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-25110 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 52% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-25110?
- CVE-2020-25110 affects Ethernut Nut/os. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-25110?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2020-25110 published?
- CVE-2020-25110 was published on 2020-12-11 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:ethernut:nut\/os:*:*:*:*:*:*:*:*
More vulnerabilities in Ethernut Nut/os
- CVE-2020-25109 — Critical (CVSS 9.8): An issue was discovered in the DNS implementation in Ethernut in Nut/OS 5.1. The number of DNS queries/responses (set…
- CVE-2020-25108 — Critical (CVSS 9.8): An issue was discovered in the DNS implementation in Ethernut in Nut/OS 5.1. The DNS response data length is not…
- CVE-2020-25107 — Critical (CVSS 9.8): An issue was discovered in the DNS implementation in Ethernut in Nut/OS 5.1. There is no check on whether a domain name…
- CVE-2020-27213 — High (CVSS 7.5): An issue was discovered in Ethernut Nut/OS 5.1. The code that generates Initial Sequence Numbers (ISNs) for TCP…
All CVEs affecting Ethernut Nut/os →
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