CVE-2023-37457

highpriority · track · 33EPSS 0.011 · 66 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.12% (66th) EPSS

CVSS 8.2 · high

Is it mine?

27 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.

cvss

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

8.2

010

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

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 4.2

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · security-advisories@github.comexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-120USprimaryCWE-120US

affected products (27)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Digium Certified Asterisk <18.9-cert6all versionscert_bundDE
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
Open Source Asterisk <18.20.1all versionscert_bundDE
Open Source Asterisk <20.5.1all versionscert_bundDE
Open Source Asterisk <21.0.1all versionscert_bundDE
Digium Certified Asterisk< 18.9-cert6cert_bundDE
Open Source Asterisk< 18.20.1cert_bundDE
Open Source Asterisk< 20.5.1cert_bundDE
Open Source Asterisk< 21.0.1cert_bundDE
asterisk asterisk≤ ≤ 18.9-cert5enisa_euvdEU
asterisk asterisk≤ = 21.0.0enisa_euvdEU
asterisk asterisk≤ 19.0.0, ≤ 20.5.0enisa_euvdEU
asterisk asterisk≤ ≤ 18.20.0enisa_euvdEU
Digium, Inc. Asterisk≤ 18.20.0fstec_bduRU
Digium, Inc. Asterisk≤ 21.0.0fstec_bduRU
Digium, Inc. Asterisk19.8.1 → 20.5.0fstec_bduRU
Digium, Inc. Certified Asterisk≤ 18.9-cert5fstec_bduRU
АО «НППКТ» ОСОН ОСнова Оnyx≤ 2.10fstec_bduRU

showing 20 of 27

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-3158Digium Certified Asterisk: Mehrere SchwachstellenDeutsch2023-12-14csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Digium Certified Asterisk und Asterisk ausnutzen, um einen Denial of Service Angriff durchzuführen oder Informationen offenzulegen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2023-12-14modified 2026-06-17

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+5664 more

references (11)

External citations — patches, advisories, analysis.

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