CVE-2021-28090

Debian Security Advisory 4871-1

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Tor before 0.4.5.7 allows a remote attacker to cause Tor directory authorities to exit with an assertion failure, aka TROVE-2021-002.

Tor versiones anteriores a 0.4.5.7, permite a un atacante remoto causar que autoridades del directorio de Tor salgan con un fallo de aserción, también se conoce como TROVE-2021-002

Two vulnerabilities were discovered in Tor, a connection-based low-latency anonymous communication system, which could lead to excessive CPU usage or cause a directory authority to crash.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

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

2021-03-08 CVE Reserved
2021-03-19 CVE Published
2024-08-03 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-617: Reachable Assertion

CAPEC

References (5)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://blog.torproject.org/node/2009	2023-11-07
https://bugs.torproject.org/tpo/core/tor/40316	2023-11-07
https://gitlab.torproject.org/tpo/core/tor/-/issues/40316	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HPDXB2GZHG3VNOTWSXQ3QZVHNV76WCU5	2023-11-07
https://security.gentoo.org/glsa/202107-25	2023-11-07

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"				< 0.3.5.14 Search vendor "Torproject" for product "Tor" and version " < 0.3.5.14"		-		Affected
Torproject Search vendor "Torproject"		Tor Search vendor "Torproject" for product "Tor"				>= 0.4.4.4 < 0.4.4.8 Search vendor "Torproject" for product "Tor" and version " >= 0.4.4.4 < 0.4.4.8"		-		Affected
Torproject Search vendor "Torproject"		Tor Search vendor "Torproject" for product "Tor"				>= 0.4.5.0 < 0.4.5.7 Search vendor "Torproject" for product "Tor" and version " >= 0.4.5.0 < 0.4.5.7"		-		Affected
Torproject Search vendor "Torproject"		Tor Search vendor "Torproject" for product "Tor"				0.4.4.0 Search vendor "Torproject" for product "Tor" and version "0.4.4.0"		alpha		Affected
Torproject Search vendor "Torproject"		Tor Search vendor "Torproject" for product "Tor"				0.4.4.1 Search vendor "Torproject" for product "Tor" and version "0.4.4.1"		alpha		Affected
Torproject Search vendor "Torproject"		Tor Search vendor "Torproject" for product "Tor"				0.4.4.2 Search vendor "Torproject" for product "Tor" and version "0.4.4.2"		alpha		Affected
Torproject Search vendor "Torproject"		Tor Search vendor "Torproject" for product "Tor"				0.4.4.3 Search vendor "Torproject" for product "Tor" and version "0.4.4.3"		alpha		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected