How severe is CVE-2020-35659?

CVE-2020-35659 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-35659 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35659?

CVE-2020-35659 affects Pi-hole. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35659?

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

When was CVE-2020-35659 published?

CVE-2020-35659 was published on 2020-12-24 and last updated on 2026-06-17.

CVE-2020-35659

CVE-2020-35659 is a medium-severity vulnerability in Pi-hole with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Pi-hole
Published: 2020-12-24
Last modified: 2026-06-17

Description

The DNS query log in Pi-hole before 5.2.2 is vulnerable to stored XSS. An attacker with the ability to directly or indirectly query DNS with a malicious hostname can cause arbitrary JavaScript to execute when the Pi-hole administrator visits the Query Log or Long-term data Query Log page.

Frequently asked questions

What is CVE-2020-35659?: The DNS query log in Pi-hole before 5.2.2 is vulnerable to stored XSS. An attacker with the ability to directly or indirectly query DNS with a malicious hostname can cause arbitrary JavaScript to execute when the Pi-hole administrator visits the Query Log or Long-term data Query Log page.
How severe is CVE-2020-35659?: CVE-2020-35659 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-35659 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35659?: CVE-2020-35659 affects Pi-hole. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35659?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-35659 published?: CVE-2020-35659 was published on 2020-12-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pi-hole:pi-hole:*:*:*:*:*:*:*:*

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