How severe is CVE-2021-3780?

CVE-2021-3780 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-2021-3780 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3780?

CVE-2021-3780 affects Framasoft Peertube. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3780?

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

When was CVE-2021-3780 published?

CVE-2021-3780 was published on 2021-09-15 and last updated on 2026-06-17.

CVE-2021-3780

CVE-2021-3780 is a medium-severity vulnerability in Framasoft Peertube 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% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Framasoft Peertube
Published: 2021-09-15
Last modified: 2026-06-17

Description

peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Frequently asked questions

What is CVE-2021-3780?: peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
How severe is CVE-2021-3780?: CVE-2021-3780 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-2021-3780 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3780?: CVE-2021-3780 affects Framasoft Peertube. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3780?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3780 published?: CVE-2021-3780 was published on 2021-09-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:framasoft:peertube:*:*:*:*:*:*:*:*

More vulnerabilities in Framasoft Peertube

CVE-2025-32948 — High (CVSS 7.5): The vulnerability allows any attacker to cause the PeerTube server to stop functioning, or in special cases send…
CVE-2025-32947 — High (CVSS 7.5): This vulnerability allows any attacker to cause the PeerTube server to stop responding to requests due to an infinite…
CVE-2022-0133 — High (CVSS 7.5): peertube is vulnerable to Improper Access Control
CVE-2022-0132 — High (CVSS 7.5): peertube is vulnerable to Server-Side Request Forgery (SSRF)
CVE-2025-32949 — Medium (CVSS 6.5): This vulnerability allows any authenticated user to cause the server to consume very large amounts of disk space when…
CVE-2025-32944 — Medium (CVSS 6.5): The vulnerability allows any authenticated user to cause the PeerTube server to stop functioning in a persistent…

All CVEs affecting Framasoft Peertube →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →