Login Request a demo
High severity · published Jul 15, 2020
CVE-2020-15572
Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network Security Services…
7.5
CVSS
1.4%
EPSS
No
On KEV
Description
Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network Security Services (NSS), aka TROVE-2020-001.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tor · Torproject
before 0.3.5.11; after 0.4.2.0 before 0.4.2.8; after 0.4.3.0 before 0.4.3.6; 0.4.4.0; 0.4.4.1 · source: NVD
Affected product
TO
Tor
Torproject
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-15572
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-15572
Release Notes
https://blog.torproject.org/new-release-tor-03511-0428-0436-security-fixes
Vendor Advisory
https://gitlab.torproject.org/tpo/core/tor/-/issues/33119
Vendor Advisory
https://trac.torproject.org/projects/tor/wiki/TROVE
More from Tor
7.5
CVE-2016-9079
Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability
9.3
CVE-2026-77642
tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or detached signature with unexpected signature digest type
9.1
CVE-2026-44603
Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007
9.1
CVE-2026-44597
Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011
9.0
CVE-2026-77638
Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point could man-in-the-middle (impersonate) the onion service that the client…