CVE-2018-18066· NVD / CVE Program· CNA mitre

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 attack

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.

HighCVSS 7.5 · v3.1—No exploit Fix available

Published: Oct 8, 2018
Updated: Jun 16, 2026
EPSS: 3.6% · 89th percentile
CWE: CWE-476

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 3.6%

CISA SSVC decision

Exploitation: proof of concept
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

Vendor	Product	CPE
net-snmp	net-snmp	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	cpe:2.3:o:netapp:e-series_santricity_os_controller
netapp	solidfire element os	cpe:2.3:o:netapp:solidfire_element_os

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

net-snmp net-snmpbefore 5.8
netapp cloud backupall versions
netapp data ontapall versions
netapp e-series santricity os controller11.0 and later · up to 11.5 inclusive
netapp hyper converged infrastructureall versions
netapp solidfire element osall versions
netapp storagegrid webscaleall versions

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	net-snmp	before 5.7.3+dfsg-1.1	5.7.3+dfsg-1.1
Red Hat:enterprise_linux:7::client	net-snmp	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-agent-libs	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-debuginfo	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-devel	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-gui	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-libs	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-perl	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-python	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-sysvinit	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:enterprise_linux:7::client	net-snmp-utils	before 1:5.7.2-47.el7	1:5.7.2-47.el7
Red Hat:rhel_eus:7.7::computenode	net-snmp	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-agent-libs	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-debuginfo	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-devel	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-gui	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-libs	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-perl	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-python	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-sysvinit	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6
Red Hat:rhel_eus:7.7::computenode	net-snmp-utils	before 1:5.7.2-43.el7_7.6	1:5.7.2-43.el7_7.6

Same product

net-snmp: all records

Other highest-scoring records for the same primary product.

CVE-2025-68615Net-SNMP snmptrapd crash
52Plan
CVE-2005-4837snmp_api.c in snmpd in Net-SNMP 5.2.x before 5.2.2, 5.1.x before 5.1.3, and 5.0.x before 5.0.10.2, when running in master agentx mode, allow
43Plan
CVE-2005-1740fixproc in Net-snmp 5.x before 5.2.1-r1 creates temporary files insecurely, which allows local users to modify the contents of those files t
43Plan
CVE-2022-44793handle_ipv6IpForwarding in agent/mibgroup/ip-mib/ip_scalars.c in Net-SNMP 5.4.3 through 5.9.3 has a NULL Pointer Exception bug that can be u
42Plan
CVE-2022-44792handle_ipDefaultTTL in agent/mibgroup/ip-mib/ip_scalars.c in Net-SNMP 5.8 through 5.9.3 has a NULL Pointer Exception bug that can be used by
42Plan
CVE-2015-5621The snmp_pdu_parse function in snmp_api.c in net-snmp 5.7.2 and earlier does not remove the varBind variable in a netsnmp_variable_list item
42Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
debian:net-snmp	5.7.3+dfsg-1.1 · Debian:12	Package registry (OSV)
red hat:net-snmp	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-agent-libs	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-debuginfo	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-devel	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-gui	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-libs	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-perl	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-python	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-sysvinit	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:net-snmp-utils	1:5.7.2-47.el7 · Red Hat:enterprise_linux:7::client	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days-1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-20-189 · Apr 1, 2020(Red Hat Enterprise Linux 7 Güvenlik Güncellemesi)

All national notices →

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:45 PM UTC

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

No Noroxi analysis for this record yet

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Data sources and verification

CNA: mitre

CVE.org (CNA)May 6, 2025, 2:41 PM UTC
CISA ADPMay 6, 2025, 2:41 PM UTC
NVDJun 16, 2026, 9:46 PM UTC
FIRST EPSSOct 10, 2026, 12:00 AM UTC
OSV / GHSAOct 11, 2026, 3:22 AM UTC

Each line is when that source was last processed for this record.

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