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Vulnerability details: VCID-2ydq-8usj-73ag
Vulnerability ID VCID-2ydq-8usj-73ag
Aliases CVE-2023-49786
Summary Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-703 Improper Check or Handling of Exceptional Conditions
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
System Score Found at
cvssv3.1 7.5 http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html
ssvc Track http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
epss 0.00055 https://api.first.org/data/v1/epss?cve=CVE-2023-49786
cvssv3.1 7.5 http://seclists.org/fulldisclosure/2023/Dec/24
ssvc Track http://seclists.org/fulldisclosure/2023/Dec/24
cvssv3.1 7.5 https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05
ssvc Track https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05
cvssv3.1 7.5 https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq
ssvc Track https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq
cvssv3.1 7.5 https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race
ssvc Track https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race
cvssv3.1 7.5 https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
ssvc Track https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
cvssv3.1 5.9 https://nvd.nist.gov/vuln/detail/CVE-2023-49786
cvssv3.1 7.5 http://www.openwall.com/lists/oss-security/2023/12/15/7
ssvc Track http://www.openwall.com/lists/oss-security/2023/12/15/7
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2023-49786
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-37457
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-38703
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-49294
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-49786
1059033 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1059033
24 http://seclists.org/fulldisclosure/2023/Dec/24
7 http://www.openwall.com/lists/oss-security/2023/12/15/7
Asterisk-20.1.0-Denial-Of-Service.html http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html
cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
cpe:2.3:a:digium:asterisk:21.0.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:digium:asterisk:21.0.0:*:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:*:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc1:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc1:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc2:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc2:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc3:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc3:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc4:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert1-rc4:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert2:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert2:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert3:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:cert3:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:rc1:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:rc1:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:13.13.0:rc2:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:13.13.0:rc2:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:-:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:-:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert1:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert1:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert10:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert10:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert11:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert11:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert12:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert12:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert2:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert2:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert3:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert3:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert4:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert4:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert5:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert5:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert6:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert6:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert7:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert7:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert8:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert8:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert9:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:16.8.0:cert9:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:18.9:cert1:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:18.9:cert1:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:18.9:cert2:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:18.9:cert2:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:18.9:cert3:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:18.9:cert3:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:18.9:cert4:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:18.9:cert4:*:*:*:*:*:*
cpe:2.3:a:sangoma:certified_asterisk:18.9:cert5:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:sangoma:certified_asterisk:18.9:cert5:*:*:*:*:*:*
CVE-2023-49786 https://nvd.nist.gov/vuln/detail/CVE-2023-49786
d7d7764cb07c8a1872804321302ef93bf62cba05 https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05
ES2023-01-asterisk-dtls-hello-race https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race
GHSA-hxj9-xwr8-w8pq https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq
msg00019.html https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-08T14:19:55Z/ Found at http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at http://seclists.org/fulldisclosure/2023/Dec/24
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

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-08T14:19:55Z/ Found at http://seclists.org/fulldisclosure/2023/Dec/24
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05
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

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-08T14:19:55Z/ Found at https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq
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

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none

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low

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-08T14:19:55Z/ Found at https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race
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

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none

low

high

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required

unchanged

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high

low

none

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low

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high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-08T14:19:55Z/ Found at https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
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

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Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-08T14:19:55Z/ Found at https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2023-49786
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

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at http://www.openwall.com/lists/oss-security/2023/12/15/7
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

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high

low

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none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2024-10-08T14:19:55Z/ Found at http://www.openwall.com/lists/oss-security/2023/12/15/7
Exploit Prediction Scoring System (EPSS)
Percentile 0.17206
EPSS Score 0.00055
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:33:50.390592+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.17/main.json 37.0.0