HOMEVULNERABILITIESCVE-2020-35652
MEDIUM

CVE-2020-35652

NVD-CWE-noinfoPublished: January 29, 2021· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

An issue was discovered in res_pjsip_diversion.c in Sangoma Asterisk before 13.38.0, 14.x through 16.x before 16.15.0, 17.x before 17.9.0, and 18.x before 18.1.0. A crash can occur when a SIP message is received with a History-Info header that contains a tel-uri, or when a SIP 181 response is received that contains a tel-uri in the Diversion header.

NVD Source

Technical Analysis

CVE-2020-35652 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

digium1 product(s)
asterisk
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://downloads.asterisk.org/pub/security/AST-2020-003.html
ADVISORYhttps://downloads.asterisk.org/pub/security/AST-2020-004.html
ADVISORYhttps://issues.asterisk.org/jira/browse/ASTERISK-29191
ADVISORYhttps://issues.asterisk.org/jira/browse/ASTERISK-29219
ADVISORYhttps://downloads.asterisk.org/pub/security/AST-2020-003.html
ADVISORYhttps://downloads.asterisk.org/pub/security/AST-2020-004.html
ADVISORYhttps://issues.asterisk.org/jira/browse/ASTERISK-29191
ADVISORYhttps://issues.asterisk.org/jira/browse/ASTERISK-29219

All References (8)

→
https://downloads.asterisk.org/pub/security/AST-2020-003.htmlVendor Advisory
→
https://downloads.asterisk.org/pub/security/AST-2020-004.htmlVendor Advisory
→
https://issues.asterisk.org/jira/browse/ASTERISK-29191Exploit · Vendor Advisory
→
https://issues.asterisk.org/jira/browse/ASTERISK-29219Vendor Advisory
→
https://downloads.asterisk.org/pub/security/AST-2020-003.htmlVendor Advisory
→
https://downloads.asterisk.org/pub/security/AST-2020-004.htmlVendor Advisory
→
https://issues.asterisk.org/jira/browse/ASTERISK-29191Exploit · Vendor Advisory
→
https://issues.asterisk.org/jira/browse/ASTERISK-29219Vendor Advisory

Quick Facts

CVE IDCVE-2020-35652
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedJan 29, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2009-2452
10.0
CVE-2026-46798
10.0
CVE-2012-1484
10.0
CVE-2005-2222
10.0
CVE-2013-2422
10.0
CVE-2009-2543
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-35652 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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