CVE-2019-18790

Name: CVE-2019-18790
Creator: NVD / NIST
Published: 2019-11-22T17:15:11.74+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 2.05%

Last modified Jun 17, 2026

CVE-2019-18790 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. A SIP request can be sent to Asterisk that can change a SIP peer's IP address. EPSS estimates a 2.05% chance of exploitation in the next 30 days.

Description

An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. A SIP request can be sent to Asterisk that can change a SIP peer's IP address. A REGISTER does not need to occur, and calls can be hijacked as a result. The only thing that needs to be known is the peer's name; authentication details such as passwords do not need to be known. This vulnerability is only exploitable when the nat option is set to the default, or auto_force_rport.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS Probability

2.05%

78.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Digium	Asterisk	>= 13.0.0, < 13.29.2
Digium	Asterisk	>= 16.0.0, < 16.6.2
Digium	Asterisk	>= 17.0.0, < 17.0.1
Digium	Certified Asterisk	13.21.0
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0

References

http://downloads.asterisk.org/pub/security/AST-2019-006.htmlPatch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00038.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.htmlMailing List, Third Party Advisory
https://www.asterisk.org/downloads/security-advisoriesVendor Advisory
http://downloads.asterisk.org/pub/security/AST-2019-006.htmlPatch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00038.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.htmlMailing List, Third Party Advisory
https://www.asterisk.org/downloads/security-advisoriesVendor Advisory

Timeline

Published: Nov 22, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18790?

How severe is CVE-2019-18790?

CVE-2019-18790 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.05% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18790?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-18790?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST