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CVE-2018-18066: snmp_oid_compare in snmplib/snmp_api.c in Net-SNMP before 5.8 has a NULL Pointer Exception bug that can be use

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This week
HIGH 7.5REMOTEUPGRADEMITIGATEMITIGATE

CVE-2018-18066 is a high-severity flaw (CVSS 7.5) affecting net-snmp, cloud backup, hyper converged infrastructure. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • High severity
  • Public exploit reference
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance3.6% (top 11%)
CISA exploited listNo
WeaknessCWE-476
Published2018-10-08
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: net-snmp · netapp

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Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

net-snmp net-snmp UPGRADE
Affected: < 5.8
Fixed in: 5.8
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy net-snmp || rpm -q net-snmp || net-snmp --version
2. UPGRADE to 5.8 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade net-snmp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade net-snmp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
netapp cloud backup MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy cloud-backup || rpm -q cloud-backup || cloud-backup --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp hyper converged infrastructure MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy hyper-converged-infrastructure || rpm -q hyper-converged-infrastructure || hyper-converged-infrastructure --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp storagegrid webscale MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy storagegrid-webscale || rpm -q storagegrid-webscale || storagegrid-webscale --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
netapp data ontap MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
netapp e-series santricity os controller UPGRADE
Affected: >= 11.0 and <= 11.5
Fixed in: newer than 11.5
Safe to downgrade to: a release before 11.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-18066?

net-snmp: upgrade to 5.8; cloud backup: mitigate or apply the listed mitigation; hyper converged infrastructure: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-18066 being exploited?

CVE-2018-18066 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-18066 affect?

CVE-2018-18066 affects net-snmp, cloud backup, hyper converged infrastructure. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2018-18066?

Priority 59/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

References

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