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TI-2020-17153 Aliases CVE-2020-28242GHSA-q5gr-h5mj-hp63

An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1…

Priority LOW 32CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-674.

Summary

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.

Why it matters now

EPSS 0.01516 74th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:*up to 16.8.0Vulnerableasterisk
cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*13.0 to before 13.37.1; 16.0 to before 16.14.1; 17.0 to before 17.8.1; 18.0 to before 18.0.1VulnerableSangoma
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:* Versions up to 16.8.0 Vulnerable ·asterisk
  • cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* Versions 13.0 to before 13.37.1; 16.0 to before 16.14.1; 17.0 to before 17.8.1; 18.0 to before 18.0.1 Vulnerable ·Sangoma
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-28242
  2. 2026-10-03 Alias added: GHSA-q5gr-h5mj-hp63

References

Advisory 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences