CVE-2020-28242: n/a vulnerability

CVE-2020-28242: 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....

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 4, 2024, 16:33 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw can make vulnerable Asterisk phone systems repeatedly send outbound call setup messages until memory is exhausted, causing Asterisk to restart or shut down. It affects availability, not confidentiality. The condition requires outbound authentication on the endpoint and a changing nonce challenge. Exposure is most likely in organizations running affected Asterisk versions with outbound authentication configured on endpoints. Internet-facing or carrier-connected SIP environments deserve closer review, but the supplied sources do not identify broader affected products beyond Asterisk. Prioritize remediation where Asterisk supports business-critical calling, emergency communications, call centers, or carrier-facing SIP trunks. The business impact is service disruption from restart or shutdown, with no source evidence of data theft or active exploitation. Mitigation focus: Upgrade Asterisk Open Source to 13.37.1, 16.14.1, 17.8.1, 18.0.1, or later.; Upgrade Certified Asterisk to 16.8-cert5 or later.; Apply Fedora or Debian security updates where Asterisk is installed from those distributions..

Prepared: Jun 5, 2026, 13:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 6, 2020, 05:02 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
FEDORA-2020-6b277646c7CVE reference · vendor-advisory, x_refsource_FEDORA
[debian-lts-announce] 20220403 [SECURITY] [DLA 2969-1] asterisk security updateCVE reference · mailing-list, x_refsource_MLIST

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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