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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...

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

3.59%Up 2.0 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List 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.

Record
CVE-2018-18066
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
EUVDEUVD-2018-9805 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.

Record
EUVD-2018-9805
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-9mpr-24m6-767p 7.5

snmp_oid_compare in snmplib/snmp_api.c in Net-SNMP before 5.8 has a NULL Pointer Exception bug...

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.

Record
GHSA-9mpr-24m6-767p
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
NVD 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.

Record
CVE-2018-18066
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
OSV 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.

Record
CVE-2018-18066
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2018-18066 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.

Record
DEBIAN-CVE-2018-18066
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2020:1081 7.5

Red Hat Security Advisory: net-snmp security and bug fix update

Record
RHSA-2020:1081
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2020:2539 7.5

Red Hat Security Advisory: net-snmp security and bug fix update

Record
RHSA-2020:2539
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2018-18066 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.

Record
UBUNTU-CVE-2018-18066
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
net-snmp
Debian:12
 before 5.7.3+dfsg-1.1
5.7.3+dfsg-1.1
net-snmp
Debian:13
 before 5.7.3+dfsg-1.1
5.7.3+dfsg-1.1
net-snmp
Debian:14
 before 5.7.3+dfsg-1.1
5.7.3+dfsg-1.1
net-snmp
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-agent-libs
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-debuginfo
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-libs
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-utils
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-devel
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-gui
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
Show 53 moreShow less
Affected packages
PackageAffectedFixed
net-snmp-perl
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-python
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-sysvinit
Red Hat:enterprise_linux:7::client
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-agent-libs
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-debuginfo
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-libs
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-utils
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-devel
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-gui
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-perl
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-python
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-sysvinit
Red Hat:enterprise_linux:7::computenode
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-agent-libs
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-debuginfo
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-devel
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-libs
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-utils
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-gui
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-perl
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-python
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-sysvinit
Red Hat:enterprise_linux:7::server
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-agent-libs
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-debuginfo
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-devel
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-libs
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-utils
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-gui
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-perl
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-python
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp-sysvinit
Red Hat:enterprise_linux:7::workstation
 before 1:5.7.2-47.el7
1:5.7.2-47.el7
net-snmp
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-agent-libs
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-debuginfo
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-libs
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-utils
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-devel
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-gui
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-perl
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-python
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-sysvinit
Red Hat:rhel_eus:7.7::computenode
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-agent-libs
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-debuginfo
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-devel
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-libs
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-utils
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-gui
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-perl
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-python
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6
net-snmp-sysvinit
Red Hat:rhel_eus:7.7::server
 before 1:5.7.2-43.el7_7.6
1:5.7.2-43.el7_7.6

History

History
RecordedChangedSources
affected
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-18066 is a high vulnerability (CVSS 7.5) in Net-snmp, published October 8, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.59%, the 89th percentile. Fixed in net-snmp 5.7.3+dfsg-1.1.

References

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