CVE-2019-20892

Exp

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.

Published: 2020-06-25 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-20892 is rated High Exploit Risk (70.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.31%). 4 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.47% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2019-20892

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-20892

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.85% 2.31% +1.47%
2 2026-05-29 0.50% 0.85% +0.35%
3 2025-11-25 — 0.50% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-20892

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2019-20892

OS Trackers for CVE-2019-20892

vendor priority summary link
alpine medium CVE-2019-20892: 1 source package rows (net-snmp); 4 state rows across 2 repos (3.11-main, 3.12-main); fixed 4, open 0. https://security.alpinelinux.org/vuln/CVE-2019-20892
debian not yet assigned CVE-2019-20892 not yet assigned priority: Debian including 1 source packages (net-snmp), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-20892
gentoo normal CVE-2019-20892: 1 GLSA(s) (202008-12), 1 atom(s) (net-analyzer/net-snmp); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-20892
redhat medium — https://access.redhat.com/security/cve/CVE-2019-20892
suse medium CVE-2019-20892 severity moderate: SUSE including 11 source package names (libsnmp30, libsnmp30-32bit, …), 85 product×package rows across 25 product lines (SUSE CaaS Platform 3.0, SUSE Liberty Linux 8, … (25 product lines)): Known Not Affected 83, Fixed 2. https://www.suse.com/security/cve/CVE-2019-20892/
ubuntu medium CVE-2019-20892 medium priority: Ubuntu including 1 source packages (net-snmp), 6 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): not-affected 4, needs-triage 1, released 1. https://ubuntu.com/security/CVE-2019-20892

Affected software / configurations for CVE-2019-20892

Vendor Product Version Raw CPE
net-snmp net-snmp <= 5.8 cpe:2.3:a:net-snmp:net-snmp:*:*:*:*:*:*:*:*
oracle zfs_storage_appliance_kit 8.8 cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*

References for CVE-2019-20892

cvelogic Threat Intelligence