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TI-2020-17177 Aliases CVE-2020-28327GHSA-ggx6-v629-c48v

A res_pjsip_session crash was discovered in Asterisk Open Source 13.x before 13.37.1…

Priority LOW 28CWE-404Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
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-404.

Summary

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.

Why it matters now

EPSS 0.01939 80th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
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 · 13

CPEVersionsRoleVendor
cpe:2.3:a:digium:certified_asterisk:16.8:-:*:*:*:*:*:*16.8VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc1:*:*:*:*:*:*16.8 cert1-rc1VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc2:*:*:*:*:*:*16.8 cert1-rc2VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc3:*:*:*:*:*:*16.8 cert1-rc3VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc4:*:*:*:*:*:*16.8 cert1-rc4VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert2:*:*:*:*:*:*16.8 cert2VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert3:*:*:*:*:*:*16.8 cert3VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert4:*:*:*:*:*:*16.8 cert4VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc1:*:*:*:*:*:*16.8 cert4-rc1VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc2:*:*:*:*:*:*16.8 cert4-rc2VulnerableDigium
  • cpe:2.3:a:digium:certified_asterisk:16.8:-:*:*:*:*:*:* Versions 16.8 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc1:*:*:*:*:*:* Versions 16.8 cert1-rc1 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc2:*:*:*:*:*:* Versions 16.8 cert1-rc2 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc3:*:*:*:*:*:* Versions 16.8 cert1-rc3 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc4:*:*:*:*:*:* Versions 16.8 cert1-rc4 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert2:*:*:*:*:*:* Versions 16.8 cert2 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert3:*:*:*:*:*:* Versions 16.8 cert3 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert4:*:*:*:*:*:* Versions 16.8 cert4 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc1:*:*:*:*:*:* Versions 16.8 cert4-rc1 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc2:*:*:*:*:*:* Versions 16.8 cert4-rc2 Vulnerable ·Digium
Show 3 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc3:*:*:*:*:*:*16.8 cert4-rc3VulnerableDigium
cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc4:*:*:*:*:*:*16.8 cert4-rc4VulnerableDigium
cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*13.0.0 to before 13.37.1; 16.0.0 to before 16.14.1; 17.0.0 to before 17.8.1; 18.0.0 to before 18.0.1VulnerableSangoma
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc3:*:*:*:*:*:* Versions 16.8 cert4-rc3 Vulnerable ·Digium
  • cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc4:*:*:*:*:*:* Versions 16.8 cert4-rc4 Vulnerable ·Digium
  • cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* Versions 13.0.0 to before 13.37.1; 16.0.0 to before 16.14.1; 17.0.0 to before 17.8.1; 18.0.0 to before 18.0.1 Vulnerable ·Sangoma

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-2020-28327
  2. 2026-10-03 Alias added: GHSA-ggx6-v629-c48v

References

Exploit 1

Patch 1

Sources

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