VDB-204079 · CVE-2022-33903 · EUVD-2022-36940

Tor Browser up to 0.4.7.7 RTT Estimation denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Tor Browser up to 0.4.7.7. The impacted element is an unknown function of the component RTT Estimation Handler. This manipulation causes denial of service. The identification of this vulnerability is CVE-2022-33903. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Tor Browser up to 0.4.7.7 (Network Encryption Software) and classified as problematic. Affected by this vulnerability is an unknown functionality of the component RTT Estimation Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.

The weakness was shared 07/18/2022. It is possible to read the advisory at lists.torproject.org. This vulnerability is known as CVE-2022-33903 since 06/17/2022. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.4.7.8 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2022-36940). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Network Encryption Software

Vendor

Name

Browser

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Browser 0.4.7.8

Timelineinfo

06/17/2022 🔍
07/18/2022 +31 days 🔍
07/18/2022 +0 days 🔍
06/12/2026 +1424 days 🔍

Sourcesinfo

Advisory: lists.torproject.org
Status: Confirmed

CVE: CVE-2022-33903 (🔍)
GCVE (CVE): GCVE-0-2022-33903
GCVE (VulDB): GCVE-100-204079
EUVD: 🔍

Entryinfo

Created: 07/18/2022 08:35
Updated: 06/12/2026 00:58
Changes: 07/18/2022 08:35 (41), 08/01/2022 16:27 (11), 06/12/2026 00:58 (15)
Complete: 🔍
Cache ID: 216::103