How severe is CVE-2021-29448?

CVE-2021-29448 has a CVSS 3.x base score of 7.6, rated high 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 high.

Is CVE-2021-29448 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-2021-29448?

CVE-2021-29448 primarily affects Pi-hole Ftldns. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-29448?

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-2021-29448 published?

CVE-2021-29448 was published on 2021-04-15 and last updated on 2026-06-17.

CVE-2021-29448

CVE-2021-29448 is a high-severity vulnerability in Pi-hole Ftldns with a CVSS 3.x base score of 7.6. 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: High (CVSS 3.x base score 7.6)
CVSS v2: 5.8
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Pi-hole Ftldns
Published: 2021-04-15
Last modified: 2026-06-17

Description

Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. The Stored XSS exists in the Pi-hole Admin portal, which can be exploited by the malicious actor with the network access to DNS server. See the referenced GitHub security advisory for patch details.

Frequently asked questions

What is CVE-2021-29448?: Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. The Stored XSS exists in the Pi-hole Admin portal, which can be exploited by the malicious actor with the network access to DNS server. See the referenced GitHub security advisory for patch details.
How severe is CVE-2021-29448?: CVE-2021-29448 has a CVSS 3.x base score of 7.6, rated high 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 high.
Is CVE-2021-29448 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-2021-29448?: CVE-2021-29448 primarily affects Pi-hole Ftldns. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-29448?: 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-2021-29448 published?: CVE-2021-29448 was published on 2021-04-15 and last updated on 2026-06-17.

References

https://github.com/pi-hole/AdminLTE/security/advisories/GHSA-cwwf-93p7-73j9

Affected products (3)

cpe:2.3:a:pi-hole:ftldns:5.7:*:*:*:*:*:*:*
cpe:2.3:a:pi-hole:pi-hole:5.2.4:*:*:*:*:*:*:*
cpe:2.3:a:pi-hole:web_interface:*:*:*:*:*:*:*:*

More vulnerabilities in Pi-hole Ftldns

CVE-2026-39849 — High (CVSS 8.8): Pi-hole FTL is the core engine of the Pi-hole network-level advertisement and tracker blocker. In versions before…
CVE-2026-35521 — High (CVSS 8.8): FTLDNS (pihole-FTL) provides an interactive API and also generates statistics for Pi-hole's Web interface. From 6.0 to…
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