How severe is CVE-2020-25926?

CVE-2020-25926 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-2020-25926 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-25926?

CVE-2020-25926 affects Hcc-embedded Nichestack Tcp/ip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-25926?

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-2020-25926 published?

CVE-2020-25926 was published on 2021-08-18 and last updated on 2026-06-17.

CVE-2020-25926

CVE-2020-25926 is a high-severity vulnerability in Hcc-embedded Nichestack Tcp/ip 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-331.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-331
Affected product: Hcc-embedded Nichestack Tcp/ip
Published: 2021-08-18
Last modified: 2026-06-17

Description

The DNS client in InterNiche NicheStack TCP/IP 4.0.1 is affected by: Insufficient entropy in the DNS transaction id. The impact is: DNS cache poisoning (remote). The component is: dns_query_type(). The attack vector is: a specific DNS response packet.

Frequently asked questions

What is CVE-2020-25926?: The DNS client in InterNiche NicheStack TCP/IP 4.0.1 is affected by: Insufficient entropy in the DNS transaction id. The impact is: DNS cache poisoning (remote). The component is: dns_query_type(). The attack vector is: a specific DNS response packet.
How severe is CVE-2020-25926?: CVE-2020-25926 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-2020-25926 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-25926?: CVE-2020-25926 affects Hcc-embedded Nichestack Tcp/ip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-25926?: 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-2020-25926 published?: CVE-2020-25926 was published on 2021-08-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hcc-embedded:nichestack_tcp\/ip:4.0.1:*:*:*:*:*:*:*

More vulnerabilities in Hcc-embedded Nichestack Tcp/ip

CVE-2020-25928 — Critical (CVSS 9.8): The DNS feature in InterNiche NicheStack TCP/IP 4.0.1 is affected by: Buffer Overflow. The impact is: execute arbitrary…
CVE-2020-25927 — High (CVSS 7.5): The DNS feature in InterNiche NicheStack TCP/IP 4.0.1 is affected by: Out-of-bounds Read. The impact is: a denial of…

All CVEs affecting Hcc-embedded Nichestack Tcp/ip →

Other CWE-331 vulnerabilities

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CVE-2024-47945 — Critical (CVSS 9.8): The devices are vulnerable to session hijacking due to insufficient entropy in its session ID generation algorithm.…
CVE-2024-25730 — Critical (CVSS 9.8): Hitron CODA-4582 and CODA-4589 devices have default PSKs that are generated from 5-digit hex values concatenated with a…
CVE-2023-49599 — Critical (CVSS 9.8): An insufficient entropy vulnerability exists in the salt generation functionality of WWBN AVideo dev master commit…
CVE-2022-34294 — Critical (CVSS 9.8): totd 1.5.3 uses a fixed UDP source port in upstream queries sent to DNS resolvers. This allows DNS cache poisoning…

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