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. NOTE: this affects net-snmp packages shipped to end users by multiple Linux distributions, but might not affect an upstream release.

• CWE-415

• http://www.openwall.com/lists/oss-security/2020/06/25/4Exploit, Mailing List, Third Party Advisory
• https://bugs.launchpad.net/ubuntu/+source/net-snmp/+bug/1877027Exploit, Issue Tracking, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1663027Exploit, Issue Tracking, Third Party Advisory
• https://github.com/net-snmp/net-snmp/commit/5f881d3bf24599b90d67a45cae7a3eb099cd71c9Patch, Third Party Advisory
• https://security.gentoo.org/glsa/202008-12Third Party Advisory
• https://sourceforge.net/p/net-snmp/bugs/2923/Exploit, Third Party Advisory
• https://usn.ubuntu.com/4410-1/Third Party Advisory
• https://www.oracle.com/security-alerts/cpujan2021.htmlPatch, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/06/25/4Exploit, Mailing List, Third Party Advisory
• https://bugs.launchpad.net/ubuntu/+source/net-snmp/+bug/1877027Exploit, Issue Tracking, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1663027Exploit, Issue Tracking, Third Party Advisory
• https://github.com/net-snmp/net-snmp/commit/5f881d3bf24599b90d67a45cae7a3eb099cd71c9Patch, Third Party Advisory
• https://security.gentoo.org/glsa/202008-12Third Party Advisory
• https://sourceforge.net/p/net-snmp/bugs/2923/Exploit, Third Party Advisory
• https://usn.ubuntu.com/4410-1/Third Party Advisory
• https://www.oracle.com/security-alerts/cpujan2021.htmlPatch, Third Party Advisory

Published

Jun 25, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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