// For flags

CVE-2021-34549

Gentoo Linux Security Advisory 202107-25

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency.

Se ha detectado un problema en Tor versiones anteriores a 0.4.6.5, también se conoce como TROVE-2021-005. Un hashing es manejado inapropiadamente para determinadas recuperaciones de datos del circuito. Consecuentemente, un atacante puede desencadenar un ID de circuito elegido por el atacante para causar ineficiencia en el algoritmo

Multiple security vulnerabilities were discovered in Tor, a connection-based low-latency anonymous communication system, which could result in denial of service or spoofing.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-06-10 CVE Reserved
  • 2021-06-28 CVE Published
  • 2024-08-04 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Torproject
Search vendor "Torproject"
 Tor
Search vendor "Torproject" for product "Tor"
 < 0.3.5.15
Search vendor "Torproject" for product "Tor" and version " < 0.3.5.15"
-
Affected
Torproject
Search vendor "Torproject"
 Tor
Search vendor "Torproject" for product "Tor"
 >= 0.4.0.0 < 0.4.4.9
Search vendor "Torproject" for product "Tor" and version " >= 0.4.0.0 < 0.4.4.9"
-
Affected
Torproject
Search vendor "Torproject"
 Tor
Search vendor "Torproject" for product "Tor"
 >= 0.4.5.0 < 0.4.5.9
Search vendor "Torproject" for product "Tor" and version " >= 0.4.5.0 < 0.4.5.9"
-
Affected
Torproject
Search vendor "Torproject"
 Tor
Search vendor "Torproject" for product "Tor"
 >= 0.4.6.0 < 0.4.6.5
Search vendor "Torproject" for product "Tor" and version " >= 0.4.6.0 < 0.4.6.5"
-
Affected