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.
Published 2020-11-06 19:15:14
Updated 2020-11-20 18:07:04
Source MITRE
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2020-28327

0.11%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 44 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-28327

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
2.1
LOW AV:N/AC:H/Au:S/C:N/I:N/A:P
3.9
2.9
NIST
5.3
MEDIUM CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
1.6
3.6
NIST

CWE ids for CVE-2020-28327

References for CVE-2020-28327

Products affected by CVE-2020-28327

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