6.5
MEDIUM
CVE-2020-35776
Sangoma Asterisk Buffer Overflow Vulnerability
Description

A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.

INFO

Published Date :

Feb. 18, 2021, 8:15 p.m.

Last Modified :

Feb. 24, 2021, 5:43 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2020-35776 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Digium asterisk
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-35776.

URL Resource
http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html Patch Third Party Advisory
http://seclists.org/fulldisclosure/2021/Feb/57 Mailing List Third Party Advisory
https://downloads.asterisk.org/pub/security/AST-2021-001.html Vendor Advisory
https://issues.asterisk.org/ Issue Tracking Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29227 Exploit Issue Tracking Patch Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-35776 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-35776 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Feb. 24, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
    Changed Reference Type http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html No Types Assigned http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html Patch, Third Party Advisory
    Changed Reference Type http://seclists.org/fulldisclosure/2021/Feb/57 No Types Assigned http://seclists.org/fulldisclosure/2021/Feb/57 Mailing List, Third Party Advisory
    Changed Reference Type https://downloads.asterisk.org/pub/security/AST-2021-001.html No Types Assigned https://downloads.asterisk.org/pub/security/AST-2021-001.html Vendor Advisory
    Changed Reference Type https://issues.asterisk.org/ No Types Assigned https://issues.asterisk.org/ Issue Tracking, Vendor Advisory
    Changed Reference Type https://issues.asterisk.org/jira/browse/ASTERISK-29227 No Types Assigned https://issues.asterisk.org/jira/browse/ASTERISK-29227 Exploit, Issue Tracking, Patch, Vendor Advisory
    Added CWE NIST CWE-120
    Added CPE Configuration OR *cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* versions from (including) 13.0.0 up to (including) 13.38.1 *cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* versions from (including) 16.0.0 up to (including) 16.15.1 *cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* versions from (including) 17.0.0 up to (including) 17.9.1 *cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* versions from (including) 18.0 up to (including) 18.1.1
  • CVE Modified by [email protected]

    Feb. 19, 2021

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-35776 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.83 }} 0.05%

score

0.80134

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability