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Fencer Vulns
medium 6.5

CVE-2018-18065 json

_set_key in agent/helpers/table_container.c in Net-SNMP before 5.8 has a NULL Pointer Exception bug that can be used by an authenticated at…

published 2018-10-08 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-9804

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
17.5%
EPSS 17.5% chance of exploitation in 30 days, percentile 97%
public exploits
1
Exploit-DB

Summary

_set_key in agent/helpers/table_container.c in Net-SNMP before 5.8 has a NULL Pointer Exception bug that can be used by an authenticated 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-4

debian advisories DEBIAN-CVE-2018-18065

  • net-snmp Ubuntu 14.04 LTS 5.7.2~dfsg-8.1ubuntu3.3
  • net-snmp Ubuntu 16.04 LTS 5.7.3+dfsg-1ubuntu4.2
  • net-snmp Ubuntu 18.04 LTS 5.7.3+dfsg-1.8ubuntu3.1

ubuntu advisories UBUNTU-CVE-2018-18065

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • net-snmp SLES 15 SP2-BCL, SLES 15 SP1-BCL, SLE Real Time 15 SP2 +15 more 5.7.3-10.9.1
  • net-snmp SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +8 more 5.7.3-6.3.1
  • net-snmp SLE Module for Basesystem 15 5.7.3-7.3.1
  • net-snmp SLES 12-LTSS 5.7.2.1-4.9.1

suse advisories SUSE-SU-2022:0050-2SUSE-SU-2022:0050-1SUSE-SU-2018:3447-2SUSE-SU-2018:3447-1SUSE-SU-2018:3333-1SUSE-SU-2018:3319-1

  • net-snmp openSUSE Tumbleweed 5.9-3.2
  • net-snmp openSUSE Leap 15.3 5.7.3-10.9.1
  • opera openSUSE Leap 15.3 NonFree 84.0.4316.14-lp153.2.36.1

opensuse advisories openSUSE-SU-2024:11082-1openSUSE-SU-2022:0050-1

  • net-snmp Arch Linux 5.8-1

arch linux advisories AVG-777

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-2018-18065 updated cvss 6.5

net-snmp: NULL pointer exception in _set_key in agent/helpers/table_container.c resulting in a denial of service

  • Red Hat Enterprise Linux 5 net-snmp Red Hat Enterprise Linux 6 net-snmp, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-python Red Hat Enterprise Linux 7 net-snmp, net-snmp-gui, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-python, +2 more Red Hat Enterprise Linux 8 net-snmp, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-agent-libs Red Hat Virtualization 4 net-snmp
    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-20-042-02 updated cvss 6.5

Siemens Industrial Products SNMP (Update F)

  • Siemens IE/PB link PN IO (6GK1411-5AB10) <V4.0.1
    affected: fixed in V4.0.1, mitigation support.industry.siemens.com
  • Siemens SCALANCE S602 <V4.1 Siemens SCALANCE S612 <V4.1 Siemens SCALANCE S623 <V4.1 Siemens SCALANCE S627-2M <V4.1
    affected: fixed in V4.1, mitigation
  • Siemens SIMATIC CP 343-1 Advanced (6GK7343-1GX31-0XE0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC CP 443-1 (6GK7443-1EX30-0XE0) <V3.3 Siemens SIMATIC CP 443-1 (6GK7443-1EX30-0XE1) <V3.3 Siemens SIMATIC CP 443-1 Advanced (6GK7443-1GX30-0XE0) <V3.3
    affected: fixed in V3.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC CP 443-1 OPC UA (6GK7443-1UX00-0XE0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC CP 1623 (6GK1162-3AA00) <V14.00.15.00_51.25.00.01
    affected: vendor fix, mitigation support.industry.siemens.com
  • Siemens SIMATIC CP 1626 (6GK1162-6AA01) <V1.1.1
    affected: fixed in V1.1.1, mitigation support.industry.siemens.com
  • Siemens SIMATIC CP 1628 (6GK1162-8AA00) <V14.00.15.00_51.25.00.01
    affected: vendor fix, mitigation support.industry.siemens.com
show 4 more
  • Siemens SIPLUS NET CP 343-1 Advanced (6AG1343-1GX31-4XE0)
    affected: mitigation, no fix planned
  • Siemens SIPLUS NET CP 443-1 (6AG1443-1EX30-4XE0) <V3.3 Siemens SIPLUS NET CP 443-1 Advanced (6AG1443-1GX30-4XE0) <V3.3
    affected: fixed in V3.3, mitigation support.industry.siemens.com
  • Siemens SIPLUS NET IE/PB link PN IO (6AG1411-5AB10-2AA0) <V4.0.1
    affected: fixed in V4.0.1, mitigation support.industry.siemens.com
  • Siemens SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) <V2.0 Siemens TIM 1531 IRC (6GK7543-1MX00-0XE0) <V2.0
    affected: fixed in V2.0, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Timeline

  1. First public exploit (EDB-45547)
  2. Published

Exploit prediction

17.50% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-45547 net-snmp 5.7.3 - (Authenticated) Denial of Service (PoC) dos, 2018-10-08
  • 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
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns 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.