How severe is CVE-2020-17470?

CVE-2020-17470 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2020-17470 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-17470?

CVE-2020-17470 affects Butok Fnet. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-17470?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-17470 published?

CVE-2020-17470 was published on 2020-12-11 and last updated on 2026-06-17.

CVE-2020-17470

CVE-2020-17470 is a medium-severity vulnerability in Butok Fnet with a CVSS 3.x base score of 5.3. 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-330.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-330
Affected product: Butok Fnet
Published: 2020-12-11
Last modified: 2026-06-17

Description

An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.

Frequently asked questions

What is CVE-2020-17470?: An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs (they are always set to 1 in _fnet_dns_poll in fnet_dns.c). This significantly simplifies DNS cache poisoning attacks.
How severe is CVE-2020-17470?: CVE-2020-17470 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2020-17470 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-17470?: CVE-2020-17470 affects Butok Fnet. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-17470?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-17470 published?: CVE-2020-17470 was published on 2020-12-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:butok:fnet:*:*:*:*:*:*:*:*

More vulnerabilities in Butok Fnet

CVE-2020-27633 — Critical (CVSS 9.1): In FNET 4.6.3, TCP ISNs are improperly random.
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