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Vulnerability details: VCID-fgcb-pkf8-43em
Vulnerability ID VCID-fgcb-pkf8-43em
Aliases CVE-2020-28242
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.
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-674 Uncontrolled Recursion
System Score Found at
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
epss 0.00407 https://api.first.org/data/v1/epss?cve=CVE-2020-28242
cvssv2 4.0 https://nvd.nist.gov/vuln/detail/CVE-2020-28242
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2020-28242
Reference id Reference type URL
http://downloads.asterisk.org/pub/security/AST-2020-002.html
https://api.first.org/data/v1/epss?cve=CVE-2020-28242
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28242
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUS54QTQCYKR36EIULYD544GXDA644HB/
974713 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=974713
cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:*
cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
CVE-2020-28242 https://nvd.nist.gov/vuln/detail/CVE-2020-28242
No exploits are available.
Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-28242
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-28242
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.6032
EPSS Score 0.00407
Published At Aug. 8, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T12:13:50.181844+00:00 EPSS Importer Import https://epss.cyentia.com/epss_scores-current.csv.gz 37.0.0