How severe is CVE-2021-3427?

CVE-2021-3427 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-2021-3427 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3427?

CVE-2021-3427 affects Deluge-torrent Deluge. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3427?

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

When was CVE-2021-3427 published?

CVE-2021-3427 was published on 2022-08-26 and last updated on 2026-06-17.

CVE-2021-3427

CVE-2021-3427 is a medium-severity vulnerability in Deluge-torrent Deluge 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)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Deluge-torrent Deluge
Published: 2022-08-26
Last modified: 2026-06-17

Description

The Deluge Web-UI is vulnerable to XSS through a crafted torrent file. The the data from torrent files is not properly sanitised as it's interpreted directly as HTML. Someone who supplies the user with a malicious torrent file can execute arbitrary Javascript code in the context of the user's browser session.

Frequently asked questions

What is CVE-2021-3427?: The Deluge Web-UI is vulnerable to XSS through a crafted torrent file. The the data from torrent files is not properly sanitised as it's interpreted directly as HTML. Someone who supplies the user with a malicious torrent file can execute arbitrary Javascript code in the context of the user's browser session.
How severe is CVE-2021-3427?: CVE-2021-3427 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-2021-3427 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3427?: CVE-2021-3427 affects Deluge-torrent Deluge. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3427?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3427 published?: CVE-2021-3427 was published on 2022-08-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:deluge-torrent:deluge:*:*:*:*:*:*:*:*

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