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Fencer Intel
high 7.5

CVE-2018-18066 json

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 attac…

published 8y ago modified 4mo ago also EUVD-2018-9805

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Patch / fix

  • net-snmp net-snmp 5.8
  • net-snmp Debian 14, Debian 13, Debian 12 5.7.3+dfsg-1.1

debian advisories DEBIAN-CVE-2018-18066

  • net-snmp RHEL 7 1:5.7.2-47.el7
  • net-snmp-gui RHEL 7 1:5.7.2-47.el7
  • net-snmp-libs RHEL 7 1:5.7.2-47.el7
  • net-snmp-perl RHEL 7 1:5.7.2-47.el7
  • net-snmp-utils RHEL 7 1:5.7.2-47.el7
  • net-snmp-python RHEL 7 1:5.7.2-47.el7
  • net-snmp-sysvinit RHEL 7 1:5.7.2-47.el7
  • net-snmp-agent-libs RHEL 7 1:5.7.2-47.el7

red hat advisories RHSA-2020:2539RHSA-2020:1081

  • net-snmp Arch Linux 5.8-1

arch linux advisories AVG-783

Is CVE-2018-18066 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-18066 updated cvss 7.5

net-snmp: NULL pointer exception in snmp_oid_compare in snmplib/snmp_api.c resulting in a denial of service

  • Red Hat Enterprise Linux 6 net-snmp, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-python
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) net-snmp 5.7.2-47.el7, net-snmp-libs 5.7.2-47.el7, net-snmp-utils 5.7.2-47.el7, net-snmp-agent-libs 5.7.2-47.el7 Red Hat Enterprise Linux Client Optional (v. 7) net-snmp-gui 5.7.2-47.el7, net-snmp-perl 5.7.2-47.el7, net-snmp-python 5.7.2-47.el7, net-snmp-sysvinit 5.7.2-47.el7 Red Hat Enterprise Linux ComputeNode (v. 7) net-snmp 5.7.2-47.el7, net-snmp-libs 5.7.2-47.el7, net-snmp-utils 5.7.2-47.el7, net-snmp-agent-libs 5.7.2-47.el7
    fixed: vendor fix RHSA-2020:1081
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) net-snmp 5.7.2-43.el7_7.6, net-snmp-libs 5.7.2-43.el7_7.6, net-snmp-utils 5.7.2-43.el7_7.6, net-snmp-agent-libs 5.7.2-43.el7_7.6
    fixed: vendor fix RHSA-2020:2539
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) net-snmp-gui 5.7.2-47.el7, net-snmp-perl 5.7.2-47.el7, net-snmp-python 5.7.2-47.el7, net-snmp-sysvinit 5.7.2-47.el7
    fixed: vendor fix RHSA-2020:1081
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) net-snmp-gui 5.7.2-43.el7_7.6, net-snmp-perl 5.7.2-43.el7_7.6, net-snmp-python 5.7.2-43.el7_7.6, net-snmp-sysvinit 5.7.2-43.el7_7.6
    fixed: vendor fix RHSA-2020:2539
  • Red Hat Enterprise Linux Server (v. 7) net-snmp 5.7.2-47.el7, net-snmp-libs 5.7.2-47.el7, net-snmp-utils 5.7.2-47.el7, net-snmp-agent-libs 5.7.2-47.el7
    fixed: vendor fix RHSA-2020:1081
  • Red Hat Enterprise Linux Server EUS (v. 7.7) net-snmp 5.7.2-43.el7_7.6, net-snmp-libs 5.7.2-43.el7_7.6, net-snmp-utils 5.7.2-43.el7_7.6, net-snmp-agent-libs 5.7.2-43.el7_7.6
    fixed: vendor fix RHSA-2020:2539
  • Red Hat Enterprise Linux Server Optional (v. 7) net-snmp-gui 5.7.2-47.el7, net-snmp-perl 5.7.2-47.el7, net-snmp-python 5.7.2-47.el7, net-snmp-sysvinit 5.7.2-47.el7
    fixed: vendor fix RHSA-2020:1081
show 3 more
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) net-snmp-gui 5.7.2-43.el7_7.6, net-snmp-perl 5.7.2-43.el7_7.6, net-snmp-python 5.7.2-43.el7_7.6, net-snmp-sysvinit 5.7.2-43.el7_7.6
    fixed: vendor fix RHSA-2020:2539
  • Red Hat Enterprise Linux Workstation (v. 7) net-snmp 5.7.2-47.el7, net-snmp-libs 5.7.2-47.el7, net-snmp-utils 5.7.2-47.el7, net-snmp-agent-libs 5.7.2-47.el7 Red Hat Enterprise Linux Workstation Optional (v. 7) net-snmp-gui 5.7.2-47.el7, net-snmp-perl 5.7.2-47.el7, net-snmp-python 5.7.2-47.el7, net-snmp-sysvinit 5.7.2-47.el7
    fixed: vendor fix RHSA-2020:1081
  • Red Hat Enterprise Linux 5 net-snmp Red Hat Enterprise Linux 8 net-snmp, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-agent-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-234-01 updated cvss 7.5

Hitachi Energy AFF66x

  • Hitachi Energy AFF660/665 <= 03.0.02
    affected: vendor fix, mitigation “Hitachi Energy recommends the following actions:” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

3.59% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • dumpco.re https://dumpco.re/blog/net-snmp-5.7.3-remote-dos referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.