TI-2020-18220 Aliases CVE-2020-35776 GHSA-4ch3-ggx2-34pj

A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1…

LOW 36CWE-120Published 2021-02-18 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

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.

Why it matters now

EPSS 0.04054 90th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:digium:asterisk::::::::	13.0.0 – 13.38.1; 16.0.0 – 16.15.1; 17.0.0 – 17.9.1; 18.0 – 18.1.1	Vulnerable	Digium

cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:* Versions 13.0.0 – 13.38.1; 16.0.0 – 16.15.1; 17.0.0 – 17.9.1; 18.0 – 18.1.1 Vulnerable ·Digium

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2020-35776
2026-10-03 Alias added: GHSA-4ch3-ggx2-34pj

References

Exploit 1

https://issues.asterisk.org/jira/browse/ASTERISK-29227

Patch 1

http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html

Advisory 3

TI-2006-05256 Integer overflow in the get_input function in the Skinny channel driver (chan_skinny.c)… CVSS 2.0HIGH 7.5
TI-2017-12542 An issue was discovered in chan_skinny.c in Asterisk Open Source 13.18.2 and older… CVSS 3.0HIGH 7.5
TI-2023-27195 Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation CVSS 3.1HIGH 7.5
TI-2017-13083 An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and… CVSS 3.0HIGH 7.5
TI-2019-13459 An issue was discovered in manager.c in Sangoma Asterisk through 13.x, 16.x, 17.x and… CVSS 3.1HIGH 8.8
TI-2018-05283 A Buffer Overflow issue was discovered in Asterisk through 13.19.1, 14.x through 14.7.5… CVSS 3.0HIGH 7.5

See all 113 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences