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CVE-2020-28242

MEDIUM
6.5
CVSS Score
Published: November 6, 2020 at 05:02 AM UTC
Updated: June 17, 2026 at 03:10 AM UTC
4 products affected across 4 vendorsDebian LinuxFedoraCertified Asterisk

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Severity
MEDIUM6.5
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Certified Asterisk· Asterisk
95%
v ≤ 16.8.0
Debian Linux· Debiandrupal
95%
9.0
Fedora· Fedora Projectrpm
95%
33
Asterisk· Sangoma
95%
13.0 ≤ v < 13.37.116.0 ≤ v < 16.14.117.0 ≤ v < 17.8.118.0 ≤ v < 18.0.1
Affected range stops below 13.37.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 16.14.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 17.8.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 18.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCVendor Advisory
Source: [email protected]
http://downloads.asterisk.org/pub/security/AST-2020-002.html
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUS54QTQCYKR36EIULYD544GXDA644HB/

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-674

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