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Fencer Vulns
medium 6.5

CVE-2019-20892 json

net-snmp before 5.8.1.pre1 has a double free in usm_free_usmStateReference in snmplib/snmpusm.c via an SNMPv3 GetBulk request.

published 2020-06-25 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-11428

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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.

Patch / fix

  • net-snmp Debian 14, Debian 13, Debian 12 5.8+dfsg-3

debian advisories DEBIAN-CVE-2019-20892

  • net-snmp Ubuntu 20.04 LTS 5.8+dfsg-2ubuntu2.1

ubuntu advisories UBUNTU-CVE-2019-20892

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • net-snmp RHEL 8 1:5.8-12.el8_1.1
  • net-snmp-libs RHEL 8 1:5.8-12.el8_1.1
  • net-snmp-utils RHEL 8 1:5.8-12.el8_1.1
  • net-snmp-agent-libs RHEL 8 1:5.8-12.el8_1.1

red hat advisories RHBA-2020:1376

  • net-snmp Alpine 3.12, Alpine 3.11 5.8-r0

alpine advisories ALPINE-CVE-2019-20892

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-20892 updated cvss 6.5

net-snmp: double free in usm_free_usmStateReference function in snmplib/snmpusm.c via an SNMPv3 GetBulk request

  • Red Hat Enterprise Linux AppStream (v. 8) net-snmp 5.8-12.el8_1.1, net-snmp-utils 5.8-12.el8_1.1, net-snmp-agent-libs 5.8-12.el8_1.1 Red Hat Enterprise Linux BaseOS (v. 8) net-snmp 5.8-12.el8_1.1, net-snmp-libs 5.8-12.el8_1.1
    fixed: vendor fix RHBA-2020:1376
  • Red Hat Enterprise Linux 5 net-snmp Red Hat Enterprise Linux 6 net-snmp, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-python Red Hat Enterprise Linux 7 net-snmp, net-snmp-gui, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-python, +2 more Red Hat Enterprise Linux 9 net-snmp, net-snmp-libs, net-snmp-perl, net-snmp-utils, python3-net-snmp, net-snmp-agent-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.31% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/ubuntu/+source/net-snmp/+bug/1877027 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1663027 referenced PoC, tagged "exploit" by a source, unverified
  • sourceforge.net https://sourceforge.net/p/net-snmp/bugs/2923/ referenced PoC, tagged "exploit" by a source, unverified
  • openwall.com http://www.openwall.com/lists/oss-security/2020/06/25/4 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.