# CVE-2019-18790: Missing authorization in n/a

> Attackers can hijack SIP calls by changing peer IP addresses without authentication when NAT settings are default, affecting Asterisk PBX systems.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 Nov 2019
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2019-18790, CVE-2019-18351, DEBIAN-CVE-2019-18790, GHSA-xv3q-rp6x-hwhw, UBUNTU-CVE-2019-18790

## What is CVE-2019-18790?

CVE-2019-18790 is a medium-severity missing authorization vulnerability in Debian Debian Linux, published on 22 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2019-18790?

It affects 3 products.


Products: Debian Debian Linux, Digium Asterisk, Digium Certified Asterisk.

## How do I fix CVE-2019-18790?

Upgrade to a fixed version.

## Is CVE-2019-18790 being exploited?

There is no known exploitation of CVE-2019-18790 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-18790 and fix it if it is affected.

What it is: CVE-2019-18790 is a medium-severity missing authorization vulnerability in Debian Debian Linux, published on 22 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-18790 in the wild and no public exploit code.

Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-18790/ (Markdown: https://insights.sbomify.com/CVE-2019-18790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-18790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-18790
- OSV: https://osv.dev/vulnerability/CVE-2019-18790

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-18790/
Summaries are generated and may contain mistakes; the official description above is the record.