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Vulnerability details: VCID-d76h-v3yp-jydf
Vulnerability ID VCID-d76h-v3yp-jydf
Aliases CVE-2024-42491
Summary Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.24.3, 20.9.3, and 21.4.3 of Asterisk and versions 18.9-cert12 and 20.7-cert2 of certified-asterisk, if Asterisk attempts to send a SIP request to a URI whose host portion starts with `.1` or `[.1]`, and res_resolver_unbound is loaded, Asterisk will crash with a SEGV. To receive a patch, users should upgrade to one of the following versions: 18.24.3, 20.9.3, 21.4.3, certified-18.9-cert12, certified-20.7-cert2. Two workarounds are available. Disable res_resolver_unbound by setting `noload = res_resolver_unbound.so` in modules.conf, or set `rewrite_contact = yes` on all PJSIP endpoints. NOTE: This may not be appropriate for all Asterisk configurations.
Status Published
Exploitability 0.5
Weighted Severity 5.1
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-252 Unchecked Return Value
CWE-476 NULL Pointer Dereference
System Score Found at
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
epss 0.0039 https://api.first.org/data/v1/epss?cve=CVE-2024-42491
cvssv3.1 5.7 https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4
ssvc Track https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4
cvssv3.1 5.7 https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742
ssvc Track https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742
cvssv3.1 5.7 https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2
ssvc Track https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2
cvssv3.1 5.7 https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8
ssvc Track https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8
cvssv3.1 5.7 https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0
ssvc Track https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0
cvssv3.1 5.7 https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9
ssvc Track https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2024-42491
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42491
42a2f4ccfa2c7062a15063e765916b3332e34cc4 https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4
4f01669c7c41c9184f3cce9a3cf1b2ebf6201742 https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742
50bf8d4d3064930d28ecf1ce3397b14574d514d2 https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2
7a0090325bfa9d778a39ae5f7d0a98109e4651c8 https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8
a15050650abf09c10a3c135fab148220cd41d3a0 https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0
CVE-2024-42491 https://nvd.nist.gov/vuln/detail/CVE-2024-42491
GHSA-v428-g3cw-7hv9 https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4
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
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-09-05T18:48:24Z/ Found at https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742
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
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-09-05T18:48:24Z/ Found at https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2
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
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-09-05T18:48:24Z/ Found at https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8
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
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-09-05T18:48:24Z/ Found at https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0
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
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-09-05T18:48:24Z/ Found at https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9
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
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2024-09-05T18:48:24Z/ Found at https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9
Exploit Prediction Scoring System (EPSS)
Percentile 0.5925
EPSS Score 0.0039
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:39:11.926846+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.18/main.json 37.0.0