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CVE-2021-26713 Details

Description

A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is caused by a signedness comparison mismatch.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://downloads.asterisk.org/pub/security/	CVE	Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2021-004.html	CVE	Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29205	CVE	Vendor Advisory
https://downloads.asterisk.org/pub/security/	[email protected]	Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2021-004.html	[email protected]	Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29205	[email protected]	Vendor Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-787	Out-of-bounds Write	[email protected]

Affected Products

Product	Versions
digium asterisk	>= 16.0.0, < 16.16.1 >= 17.0.0, < 17.9.2 >= 18.0.0, < 18.2.1
CPE cpe:2.3:a:digium:asterisk:::::::: Remediation No remediation found in references.
digium certified asterisk	16.8 - 16.8 cert1-rc1 16.8 cert1-rc2 16.8 cert1-rc3 16.8 cert1-rc4
CPE 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:::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Feb 26, 2021	Initial Analysis	[email protected]