VDB-180810 · CVE-2021-33056 · Nessus 262832

Belledonne Belle-sip up to 4.5.19 SIP Message 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.
3.4	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in Belledonne Belle-sip up to 4.5.19. This vulnerability affects unknown code of the component SIP Message Handler. The manipulation results in denial of service. This vulnerability is known as CVE-2021-33056. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Belledonne Belle-sip up to 4.5.19 (IP Phone Software). Affected is an unknown function of the component SIP Message Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability.

The weakness was published 08/13/2021. The advisory is available at github.com. This vulnerability is traded as CVE-2021-33056. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 262832 (Linux Distros Unpatched Vulnerability : CVE-2021-33056), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.5.20 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (262832). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

IP Phone Software

Vendor

Belledonne

Name

Belle-sip

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

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

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 262832
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-33056

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Belle-sip 4.5.20
Patch: github.com

Timelineinfo

05/17/2021 🔍
08/13/2021 +88 days 🔍
08/13/2021 +0 days 🔍
09/11/2025 +1489 days 🔍

Sourcesinfo

Advisory: github.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-33056 (🔍)
GCVE (CVE): GCVE-0-2021-33056
GCVE (VulDB): GCVE-100-180810

Entryinfo

Created: 08/13/2021 08:24
Updated: 09/11/2025 00:25
Changes: 08/13/2021 08:24 (41), 08/18/2021 07:16 (3), 09/11/2025 00:25 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.