01 Record

CVE-2021-39246

Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact timestamps of these onion-service visits are

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 Description

Tor Browser through 10.5.6 and 11.x through 11.0a4 allows a correlation attack that can compromise the privacy of visits to v2 onion addresses. Exact timestamps of these onion-service visits are

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.47% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 40.7% of scored records. A rank, not a probability.
NVD base score: 6.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-09-24 18:08Z5 YR AGO

Last updated

2024-08-04 02:06Z2 YR AGO

Reserved

2021-08-17

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-532Insertion of Sensitive Information into Log FileBase

Data version

5.1

Document digest

b73714e01bdc1c671250d408fa19c5fbbcc97f2f3add18ad83f1455d488d8f69

05 Affected products

VendorProductVersionsPlatforms

applemacosNot specified—

linuxlinux_kernelNot specified—

microsoftwindowsNot specified—

torprojecttor_browserNot specified—

06 References

github.comhttps://github.com/sickcodes/security/blob/master/advisories/SICK-2021-111.mdx_refsource_MISC
sick.codeshttps://sick.codes/sick-2021-111x_refsource_MISC
www.privacyaffairs.comhttps://www.privacyaffairs.com/cve-2021-39246-tor-vulnerabilityx_refsource_MISC
gitlab.torproject.orghttps://gitlab.torproject.org/tpo/core/tor/-/commit/80c404c4b79f3bcba3fc4585d4c62a62a04f3ed9x_refsource_MISC
gitlab.torproject.orghttps://gitlab.torproject.org/tpo/core/tor/-/merge_requests/434x_refsource_MISC