CVE-2021-26717
Sangoma Asterisk T.38 Crash Vulnerability
Description
An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.
INFO
Published Date :
Feb. 18, 2021, 8:15 p.m.
Last Modified :
Feb. 24, 2021, 5:34 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
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-2021-26717.
| URL | Resource |
|---|---|
| http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html | Third Party Advisory |
| http://seclists.org/fulldisclosure/2021/Feb/58 | Mailing List Patch Third Party Advisory |
| https://downloads.asterisk.org/pub/security/ | Vendor Advisory |
| https://downloads.asterisk.org/pub/security/AST-2021-002.html | Vendor Advisory |
| https://issues.asterisk.org/jira/browse/ASTERISK-29203 | 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-2021-26717 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-26717 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 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Changed Reference Type http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html No Types Assigned http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html Third Party Advisory Changed Reference Type http://seclists.org/fulldisclosure/2021/Feb/58 No Types Assigned http://seclists.org/fulldisclosure/2021/Feb/58 Mailing List, Patch, Third Party Advisory Changed Reference Type https://downloads.asterisk.org/pub/security/ No Types Assigned https://downloads.asterisk.org/pub/security/ Vendor Advisory Changed Reference Type https://downloads.asterisk.org/pub/security/AST-2021-002.html No Types Assigned https://downloads.asterisk.org/pub/security/AST-2021-002.html Vendor Advisory Changed Reference Type https://issues.asterisk.org/jira/browse/ASTERISK-29203 No Types Assigned https://issues.asterisk.org/jira/browse/ASTERISK-29203 Issue Tracking, Patch, Vendor Advisory Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* versions from (including) 16.0.0 up to (excluding) 16.16.1 *cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* versions from (including) 17.0.0 up to (excluding) 17.9.2 *cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* versions from (including) 18.0 up to (excluding) 18.2.1 *cpe:2.3:a:digium:certified_asterisk:16.8:-:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc1:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc2:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc3:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc4:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert2:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert3:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert4:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc1:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc2:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc3:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc4:*:*:*:*:*:* *cpe:2.3:a:digium:certified_asterisk:16.8:cert5:*:*:*:*:*:* -
CVE Modified by [email protected]
Feb. 19, 2021
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-26717 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-26717
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.19 }} 0.02%
score
0.56077
percentile