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Vulnerability details: VCID-x4p3-wad9-ykes
Vulnerability ID VCID-x4p3-wad9-ykes
Aliases CVE-2020-35776
Summary A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
System Score Found at
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
epss 0.001 https://api.first.org/data/v1/epss?cve=CVE-2020-35776
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-35776
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2020-35776
Reference id Reference type URL
http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html
https://api.first.org/data/v1/epss?cve=CVE-2020-35776
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-35776
https://downloads.asterisk.org/pub/security/AST-2021-001.html
http://seclists.org/fulldisclosure/2021/Feb/57
https://issues.asterisk.org/
https://issues.asterisk.org/jira/browse/ASTERISK-29227
983158 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=983158
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:*:*:*:*:*:*:*:*
CVE-2020-35776 https://nvd.nist.gov/vuln/detail/CVE-2020-35776
No exploits are available.
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-35776
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:N/UI:R/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-35776
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 0.28485
EPSS Score 0.001
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:31:27.261008+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.22/main.json 37.0.0