VDB-170216 · CVE-2021-26714 · GCVE-0-2021-26714

Digium Asterisk up to 16.16.0/17.9.1/18.2.0 WebRTC Client res_rtp_asterisk.c stack-based overflow

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.
4.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Digium Asterisk up to 16.16.0/17.9.1/18.2.0 and classified as critical. This affects an unknown part of the file res_rtp_asterisk.c of the component WebRTC Client Handler. Such manipulation leads to stack-based overflow. This vulnerability is documented as CVE-2021-26714. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Digium Asterisk up to 16.16.0/17.9.1/18.2.0 (Communications System). It has been rated as critical. Affected by this issue is an unknown code of the file res_rtp_asterisk.c of the component WebRTC Client Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is availability.

The weakness was released 02/21/2021. The advisory is shared for download at issues.asterisk.org. This vulnerability is handled as CVE-2021-26714. There are known technical details, but no exploit is available.

Upgrading to version 16.16.1, 17.9.2 or 18.2.1 eliminates this vulnerability. The upgrade is hosted for download at downloads.asterisk.org.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Communications System

Vendor

Digium

Name

Asterisk

Version

License

open-source

Website

Vendor: https://www.digium.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
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: Stack-based overflow
CWE: CWE-121 / CWE-119
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: Asterisk 16.16.1/17.9.2/18.2.1

Timelineinfo

02/05/2021 🔍
02/21/2021 +16 days 🔍
02/21/2021 +0 days 🔍
03/03/2021 +10 days 🔍

Sourcesinfo

Vendor: digium.com

Advisory: issues.asterisk.org
Status: Not defined

CVE: CVE-2021-26714 (🔍)
GCVE (CVE): GCVE-0-2021-26714
GCVE (VulDB): GCVE-100-170216

Entryinfo

Created: 02/21/2021 11:35
Updated: 03/03/2021 23:07
Changes: 02/21/2021 11:35 (41), 03/03/2021 23:07 (1)
Complete: 🔍
Cache ID: 216::103