CVE-2018-18066

Exp

snmp_oid_compare in snmplib/snmp_api.c in Net-SNMP before 5.8 has a NULL Pointer Exception bug that can be used by an unauthenticated attacker to remotely cause the instance to crash via a crafted UDP packet, resulting in Denial of Service.

Published: 2018-10-08 Last update: 2025-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-18066 is rated High Exploit Risk (67.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.59%). 1 public exploit reference(s) are indexed (Exploit-DB). 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-2018-18066

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

Exploit prediction scoring system (EPSS) score for CVE-2018-18066

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 2025-11-21 2.12% 0.59% -1.53%
2 2025-11-18 0.60% 2.12% +1.51%
3 2025-07-03 — 0.60% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-18066

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/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:N)
No account or special rights needed—anonymous or random user is enough.
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.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/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:N)
No account or special rights needed—anonymous or random user is enough.
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.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/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:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-18066

OS Trackers for CVE-2018-18066

vendor priority summary link
debian not yet assigned CVE-2018-18066 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-2018-18066
redhat medium — https://access.redhat.com/security/cve/CVE-2018-18066
ubuntu medium CVE-2018-18066 medium priority: Ubuntu including 1 source packages (net-snmp), 4 status rows across 4 suites (bionic, trusty, upstream, xenial): not-affected 3, released 1. https://ubuntu.com/security/CVE-2018-18066

Affected software / configurations for CVE-2018-18066

Vendor Product Version Raw CPE
net-snmp net-snmp < 5.8 cpe:2.3:a:net-snmp:net-snmp:*:*:*:*:*:*:*:*
netapp cloud_backup — cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
netapp hyper_converged_infrastructure — cpe:2.3:a:netapp:hyper_converged_infrastructure:-:*:*:*:*:*:*:*
netapp storagegrid_webscale — cpe:2.3:a:netapp:storagegrid_webscale:-:*:*:*:*:*:*:*
netapp data_ontap — cpe:2.3:o:netapp:data_ontap:-:*:*:*:*:*:*:*
netapp e-series_santricity_os_controller >= 11.0, <= 11.5 cpe:2.3:o:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*
netapp solidfire_element_os — cpe:2.3:o:netapp:solidfire_element_os:-:*:*:*:*:*:*:*

References for CVE-2018-18066

cvelogic Threat Intelligence