CVE-2019-18790

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.

Published: 2019-11-22 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-18790 is rated Moderate Risk (59.5/100): CVSS Medium severity, with high exploitation likelihood (EPSS 7.42%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.57% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-18790

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 5.85% 7.42% +1.57%
2 2025-11-18 7.42% 5.85% -1.57%
3 2025-05-14 — 7.42% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-18790

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 2.5 [email protected]
5.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 4.9 [email protected]

Weakness enumeration for CVE-2019-18790

OS Trackers for CVE-2019-18790

vendor priority summary link
alpine medium CVE-2019-18790: 1 source package rows (asterisk); 25 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 15. https://security.alpinelinux.org/vuln/CVE-2019-18790
debian not yet assigned CVE-2019-18790 not yet assigned priority: Debian including 1 source packages (asterisk), 2 status rows across 2 suites (bullseye, sid): resolved 2. https://security-tracker.debian.org/tracker/CVE-2019-18790
ubuntu medium CVE-2019-18790 medium priority: Ubuntu including 1 source packages (asterisk), 18 status rows across 18 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 11, needs-triage 4, ignored 2, DNE 1. https://ubuntu.com/security/CVE-2019-18790

Affected software / configurations for CVE-2019-18790

Vendor Product Version Raw CPE
digium asterisk >= 13.0.0, < 13.29.2 cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
digium asterisk >= 16.0.0, < 16.6.2 cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
digium asterisk >= 17.0.0, < 17.0.1 cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
digium certified_asterisk 13.21.0 cpe:2.3:a:digium:certified_asterisk:13.21.0:*:*:*:*:*:*:*
digium certified_asterisk 13.21.0 cpe:2.3:a:digium:certified_asterisk:13.21.0:cert1:*:*:*:*:*:*
digium certified_asterisk 13.21.0 cpe:2.3:a:digium:certified_asterisk:13.21.0:cert2:*:*:*:*:*:*
digium certified_asterisk 13.21.0 cpe:2.3:a:digium:certified_asterisk:13.21.0:cert3:*:*:*:*:*:*
digium certified_asterisk 13.21.0 cpe:2.3:a:digium:certified_asterisk:13.21.0:cert4:*:*:*:*:*:*
digium certified_asterisk 13.21.0 cpe:2.3:a:digium:certified_asterisk:13.21.0:rc1:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2019-18790

cvelogic Threat Intelligence