Improper Resource Shutdown or Release in Asterisk

Published: 2020-11-06 | Updated: 2021-02-26
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-28327
Exploitation vector Network
Public exploit N/A
Vulnerable software
Asterisk Open Source
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor Digium (Linux Support Services)

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper Resource Shutdown or Release

EUVDB-ID: #VU50962

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-28327

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

Exploit availability: No


The vulnerability allows a remote authenticated user to perform a denial of service (DoS) attack.

A res_pjsip_session crash was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1. and Certified Asterisk before 16.8-cert5. Upon receiving a new SIP Invite, Asterisk did not return the created dialog locked or referenced. This caused a gap between the creation of the dialog object, and its next use by the thread that created it. Depending on some off-nominal circumstances and timing, it was possible for another thread to free said dialog in this gap. Asterisk could then crash when the dialog object, or any of its dependent objects, were dereferenced or accessed next by the initial-creation thread. Note, however, that this crash can only occur when using a connection-oriented protocol (e.g., TCP or TLS, but not UDP) for SIP transport. Also, the remote client must be authenticated, or Asterisk must be configured for anonymous calling.


Install update from vendor's website.

Vulnerable software versions

Asterisk Open Source: 16.0.0 - 16.6.2

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.