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No exploitation reportedFix available

CVE-2021-41867

No exploitation reported by the sources we read.

  • Published2021-10-04
  • Fixed in2.4

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An information disclosure vulnerability in OnionShare 2.3 before 2.4 allows remote unauthenticated attackers to retrieve the full list of participants of a non-public OnionShare node via the --chat feature.

Timeline

dates in UTC
  1. 2021-10-0414:15CVE publishedNVD

Versions per branch

NVD · OSV
Onionshare
BranchAffectedFixed in
2.x≥ 2.3, < 2.42.4

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • onionshareUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • onionshareUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • onionshareUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • onionshareUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • onionshareDebian:14all versions · fixed in 2.5-1
  • onionshareDebian:13all versions · fixed in 2.5-1
  • onionshareDebian:12all versions · fixed in 2.5-1
  • python-onionshareopenSUSE:Tumbleweedall versions · fixed in 2.4-1.1

1 more package range on OSV.dev

Vendor advisories

  • CVE-2021-41867 Red Hat Product Security

    onionshare: disclosure of chat participants to unauthenticated users when using –chat option in non-public mode

Full record on NVD

Fix

  1. Update Onionshare to 2.4

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
2021-10-04
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-6rvj-pw9w-jcvc

Frequently asked questions

What is CVE-2021-41867?

An information disclosure vulnerability in OnionShare 2.3 before 2.4 allows remote unauthenticated attackers to retrieve the full list of participants of a non-public OnionShare node via the --chat feature.

Is CVE-2021-41867 actively exploited?

Active exploitation of CVE-2021-41867 has not been confirmed. Its EPSS score was 1.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-41867?

CVE-2021-41867 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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Sources for this record