net-snmp up to 5.7 snmplib/snmp_api.c UDP Packet null pointer dereference

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in net-snmp up to 5.7. It has been classified as problematic. This affects an unknown function in the library snmplib/snmp_api.c. Performing a manipulation as part of UDP Packet results in null pointer dereference. This vulnerability is reported as CVE-2018-18066. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in net-snmp up to 5.7 (Network Management Software). This affects an unknown code block in the library snmplib/snmp_api.c. The manipulation as part of a UDP Packet leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

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.

The bug was discovered 10/08/2018. The weakness was disclosed 10/08/2018 (Website). It is possible to read the advisory at dumpco.re. This vulnerability is uniquely identified as CVE-2018-18066 since 10/08/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.8 eliminates this vulnerability.

The entries VDB-125066 and VDB-143748 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Network Management Software

Name

net-snmp

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: net-snmp 5.8
Patch: sourceforge.net

Timelineinfo

10/08/2018 🔍
10/08/2018 +0 days 🔍
10/08/2018 +0 days 🔍
10/08/2018 +0 days 🔍
10/09/2018 +1 days 🔍
05/06/2025 +2401 days 🔍

Sourcesinfo

Advisory: 7ffb8e25
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-18066 (🔍)
GCVE (CVE): GCVE-0-2018-18066
GCVE (VulDB): GCVE-100-125067
See also: 🔍

Entryinfo

Created: 10/09/2018 08:14
Updated: 05/06/2025 20:29
Changes: 10/09/2018 08:14 (59), 03/31/2020 16:58 (2), 05/23/2023 10:19 (5), 05/06/2025 20:29 (17)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.