CVE-2020-28242

MEDIUM EPSS 71.8%
Published Nov 6, 20205y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Nov 6, 2020 5y ago
Last Modified Jun 17, 2026 2w ago

Description

An issue 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. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
71.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-674

Affected Products 7

VendorProductVersionRange
asteriskcertified_asterisk* ≤16.8.0
sangomaasterisk*≥13.0  –  <13.37.1
sangomaasterisk*≥16.0  –  <16.14.1
sangomaasterisk*≥17.0  –  <17.8.1
sangomaasterisk*≥18.0  –  <18.0.1
fedoraprojectfedora33any
debiandebian_linux9.0any

References 3

  • downloads.asterisk.org http://downloads.asterisk.org/pub/security/AST-2020-002.html
    Vendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html
    Mailing ListThird Party Advisory
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUS54QTQCYKR36EIULYD544GXDA644HB/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.