CVE-2020-28242

mediumpriority · track · 27EPSS 0.015 · 74 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.52% (74th) EPSS

CVSS 4 · medium

Is it mine?

8 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04mediumAV:N/AC:L/Au:S/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 8 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-674USprimary

affected products (8)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
asterisk certified asterisk≤ 16.8.0nvdUScpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:*
debian debian linux= 9.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
fedoraproject fedora= 33nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
sangoma asterisk13.0 → 13.37.1nvdUScpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
sangoma asterisk16.0 → 16.14.1nvdUScpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
sangoma asterisk17.0 → 17.8.1nvdUScpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*
sangoma asterisk18.0 → 18.0.1nvdUScpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2020-11-06modified 2026-06-17

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+723 more

references (10)

External citations — patches, advisories, analysis.

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